1.
United States Army
–
The United States Armed Forces are the federal armed forces of the United States. They consist of the Army, Marine Corps, Navy, Air Force, from the time of its inception, the military played a decisive role in the history of the United States. A sense of unity and identity was forged as a result of victory in the First Barbary War. Even so, the Founders were suspicious of a permanent military force and it played an important role in the American Civil War, where leading generals on both sides were picked from members of the United States military. Not until the outbreak of World War II did a standing army become officially established. The National Security Act of 1947, adopted following World War II and during the Cold Wars onset, the U. S. military is one of the largest militaries in terms of number of personnel. It draws its personnel from a pool of paid volunteers. As of 2016, the United States spends about $580.3 billion annually to fund its military forces, put together, the United States constitutes roughly 40 percent of the worlds military expenditures. For the period 2010–14, the Stockholm International Peace Research Institute found that the United States was the worlds largest exporter of major arms, the United States was also the worlds eighth largest importer of major weapons for the same period. The history of the U. S. military dates to 1775 and these forces demobilized in 1784 after the Treaty of Paris ended the War for Independence. All three services trace their origins to the founding of the Continental Army, the Continental Navy, the United States President is the U. S. militarys commander-in-chief. Rising tensions at various times with Britain and France and the ensuing Quasi-War and War of 1812 quickened the development of the U. S. Navy, the reserve branches formed a military strategic reserve during the Cold War, to be called into service in case of war. Time magazines Mark Thompson has suggested that with the War on Terror, Command over the armed forces is established in the United States Constitution. The sole power of command is vested in the President by Article II as Commander-in-Chief, the Constitution also allows for the creation of executive Departments headed principal officers whose opinion the President can require. This allowance in the Constitution formed the basis for creation of the Department of Defense in 1947 by the National Security Act, the Defense Department is headed by the Secretary of Defense, who is a civilian and member of the Cabinet. The Defense Secretary is second in the chain of command, just below the President. Together, the President and the Secretary of Defense comprise the National Command Authority, to coordinate military strategy with political affairs, the President has a National Security Council headed by the National Security Advisor. The collective body has only power to the President
2.
United States Marine Corps
–
The U. S. Marine Corps is one of the four armed service branches in the U. S. Department of Defense and one of the seven uniformed services of the United States. The current Chairman of the Joint Chiefs of Staff, the military officer in the U. S. Armed Forces, is a Marine Corps general, the Marine Corps has been a component of the U. S. Department of the Navy since 30 June 1834, working closely with naval forces for training, transportation, and logistics. The USMC operates posts on land and aboard sea-going amphibious warfare ships around the world, two battalions of Continental Marines were formed on 10 November 1775 in Philadelphia as a service branch of infantry troops capable of fighting for independence both at sea and on shore. The role of the Corps has since grown and evolved, expanding to aerial warfare and earning popular titles such as, Americas third air force, and, second land army. By the mid-20th century, the U. S. Marine Corps had become a major theorist of and its ability to rapidly respond on short notice to expeditionary crises gives it a strong role in the implementation and execution of American foreign policy. As of 2016, the USMC has around 182,000 active duty members and it is the smallest of the U. S. The USMC serves as an expeditionary force-in-readiness and this last clause, while seemingly redundant given the Presidents position as Commander-in-chief, is a codification of the expeditionary responsibilities of the Marine Corps. It derives from similar language in the Congressional acts For the Better Organization of the Marine Corps of 1834, in 1951, the House of Representatives Armed Services Committee called the clause one of the most important statutory – and traditional – functions of the Marine Corps. In addition to its duties, the Marine Corps conducts Visit, Board, Search, and Seizure operations, as well as missions in direct support of the White House. The Marine Band, dubbed the Presidents Own by Thomas Jefferson, Marines from Ceremonial Companies A & B, quartered in Marine Barracks, Washington, D. C. The Executive Flight Detachment also provides transport to Cabinet members. The relationship between the Department of State and the U. S. Marine Corps is nearly as old as the corps itself, for over 200 years, Marines have served at the request of various Secretaries of State. After World War II, an alert, disciplined force was needed to protect American embassies, consulates, in 1947, a proposal was made that the Department of War furnish Marine Corps personnel for Foreign Service guard duty under the provisions of the Foreign Service Act of 1946. A formal Memorandum of Agreement was signed between the Department of State and the Secretary of the Navy on December 15,1948, during the first year of the MSG program,36 detachments were deployed worldwide. Continental Marines manned raiding parties, both at sea and ashore, the Advanced Base Doctrine of the early 20th century codified their combat duties ashore, outlining the use of Marines in the seizure of bases and other duties on land to support naval campaigns. Throughout the late 19th and 20th centuries, Marine detachments served aboard Navy cruisers, battleships, Marine detachments served in their traditional duties as a ships landing force, manning the ships weapons and providing shipboard security. Marines would develop tactics and techniques of amphibious assault on defended coastlines in time for use in World War II, during World War II, Marines continued to serve on capital ships
3.
Portuguese Colonial War
–
The Portuguese regime was overthrown by a military coup in 1974, and the change in government brought the conflict to an end. The war was an ideological struggle in Lusophone Africa and surrounding nations. The prevalent Portuguese and international historical approach considers the Portuguese Colonial War as a conflict fought in three separate theaters of operations. However, some other approaches consider the existence of three conflicts, the Angolan War of Independence, the Guinea-Bissau War of Independence. Occasionally, the conflict that led to the 1961 Indian Annexation of Goa is also included. During the ensuing conflict, atrocities were committed by all forces involved, throughout the period Portugal faced increasing dissent, arms embargoes and other punitive sanctions imposed by the international community. The end of the war came with the Carnation Revolution military coup of April 1974 and this migration is regarded as one of the largest peaceful migrations in the worlds history. The former colonies faced severe problems after independence, devastating and violent civil wars followed in Angola and Mozambique, which lasted several decades, claimed millions of lives, and resulted in large numbers of displaced refugees. A level of order and economic development comparable to what had existed under Portuguese rule, including during the period of the Colonial War. Portugal had been the first modern European power to establish a colony in Africa when it captured Ceuta in 1415, when the Portuguese began trading on the west coast of Africa, in the 15th century, they concentrated their energies on Guinea and Angola. Hoping at first for gold, they found that slaves were the most valuable commodity available in the region for export. The Islamic Empire was already well-established in the African slave trade, but the Portuguese never established much more than a foothold in either place. In Guinea, rival Europeans grabbed much of the trade while local African rulers confined the Portuguese to the coast and these rulers then sent enslaved Africans to the Portuguese ports, or to forts in Africa from where they were exported. Thousands of kilometers down the coast, in Angola, the Portuguese found it harder to consolidate their early advantage against encroachments by Dutch, British. Nevertheless, the fortified Portuguese towns of Luanda and Benguela remained almost continuously in Portuguese hands, as in Guinea, the slave trade became the basis of the local economy in Angola. More than a million men, women and children were shipped from Angola across the Atlantic, in this region, unlike Guinea, the trade remained largely in Portuguese hands. Nearly all the slaves were destined for Brazil and these sertanejos lived alongside Swahili traders and even obtained employment among Shona kings as interpreters and political advisers. One such sertanejo managed to travel through almost all the Shona kingdoms, including the Mutapa Empires metropolitan district, the Portuguese finally entered into direct relations with the Mwenemutapa in the 1560s
4.
Gun barrel
–
A gun barrel is a part of firearms and artillery pieces. The hollow interior of the barrel is called the bore, a gun barrel must be able to hold in the expanding gas produced by the propellants to ensure that optimum muzzle velocity is attained by the projectile as it is being pushed out by the expanding gas. Modern small arms barrels are made of known and tested to withstand the pressures involved. Artillery pieces are made by various techniques providing reliably sufficient strength, early firearms were muzzle-loading, with powder, and then shot loaded from the muzzle, capable of only a low rate of fire. During the 19th century effective mechanical locks were invented that sealed a breech-loading weapon against the escape of propellant gases, the early Chinese, the inventors of gunpowder, used bamboo, a naturally tubular stalk, as the first barrels in gunpowder projectile weapons. Early European guns were made of iron, usually with several strengthening bands of the metal wrapped around circular wrought iron rings. The Chinese were the first to master cast-iron cannon barrels, early cannon barrels were very thick for their caliber. Bore evacuator Bore snake Cannon Muzzle Polygonal rifling Rifling Slug barrel Smoothbore
5.
Shell (projectile)
–
A shell is a payload-carrying projectile that, as opposed to shot, contains an explosive or other filling, though modern usage sometimes includes large solid projectiles properly termed shot. Solid shot may contain a pyrotechnic compound if a tracer or spotting charge is used, originally, it was called a bombshell, but shell has come to be unambiguous in a military context. Words cognate with grenade are still used for an artillery or mortar projectile in some European languages, shells are usually large-calibre projectiles fired by artillery, combat vehicles, and warships. Shells usually have the shape of a cylinder topped by a nose for good aerodynamic performance, possibly with a tapering base. Solid cannonballs did not need a fuse, but hollow munitions filled with something such as gunpowder to fragment the ball, needed a fuse, percussion fuses with a spherical projectile presented a challenge because there was no way of ensuring that the impact mechanism hit the target. Therefore, shells needed a fuse that was ignited before or during firing. The earliest record of shells being used in combat was by the Republic of Venice at Jadra in 1376, shells with fuses were used at the 1421 siege of St Boniface in Corsica. These were two hollowed hemispheres of stone or bronze held together by an iron hoop, as described in their book, these hollow, gunpowder-packed shells were made of cast iron. At least since the 16th Century grenades made of ceramics or glass were in use in Central Europe, a hoard of several hundred ceramic greandes were discovered during building works in front of a bastion of the Bavarian City of Ingolstadt, Germany dated to the 17th Century. Lots of the grenades obtained their orignal blackpowder loads and igniters, most probably the grenades were intentionally dumped the moat of the bastion before the year 1723. Early powder burning fuses had to be loaded fuse down to be ignited by firing or a portfire put down the barrel to light the fuse, other shells were wrapped in bitumen cloth, which would ignite during the firing and in turn ignite a powder fuse. Nevertheless, shells came into use in the 16th Century. By the 18th Century, it was known that the fuse towards the muzzle could be lit by the flash through the windage between the shell and the barrel, the use of exploding shells from field artillery became relatively commonplace from early in the 19th century. Until the mid 19th century, shells remained as simple exploding spheres that used gunpowder and they were usually made of cast iron, but bronze, lead, brass and even glass shell casings were experimented with. The word bomb encompassed them at the time, as heard in the lyrics of The Star-Spangled Banner, typically, the thickness of the metal body was about a sixth of their diameter and they were about two thirds the weight of solid shot of the same calibre. To ensure that shells were loaded with their fuses towards the muzzle, in 1819, a committee of British artillery officers recognised that they were essential stores and in 1830 Britain standardised sabot thickness as a half inch. The sabot was also intended to reduce jamming during loading, despite the use of exploding shell, the use of smoothbore cannons, firing spherical projectiles of shot, remained the dominant artillery method until the 1850s. By the late 18th century, artillery could use canister shot to defend itself from infantry or cavalry attack and this involved loading a tin or canvas container filled with small iron or lead balls instead of the usual cannonball
6.
Utah Beach
–
Utah Beach was the code name for one of the five sectors of the Allied invasion of German-occupied France in the Normandy landings on June 6,1944, during World War II. The westernmost of the five landing beaches, Utah is on the Cotentin Peninsula, west of the mouths of the Douve, the objective at Utah was to secure a beachhead on the Cotentin Peninsula, the location of important port facilities at Cherbourg. The amphibious assault, primarily by the US 4th Infantry Division and 70th Tank Battalion, was supported by landings of the 82nd. The intention was to seal off the Cotentin Peninsula, prevent the Germans from reinforcing Cherbourg. Utah, along with Sword Beach on the flank, was added to the invasion plan in December 1943. These changes doubled the frontage of the invasion and necessitated a delay so that additional landing craft. Allied forces attacking Utah Beach faced two battalions of the 919th Grenadier Regiment, part of the 709th Static Infantry Division, while some airborne objectives were quickly met, many paratroopers landed far from their drop zones and were unable to fulfill their objectives on the first day. On the beach itself, infantry and tanks landed in four waves beginning at 06,30, meanwhile, engineers set to work clearing the area of obstacles and mines, and additional waves of reinforcements continued to arrive. At the close of D-Day, Allied forces had captured about half of the planned area and contingents of German defenders remained. The 4th Infantry Division landed 21,000 troops on Utah at the cost of only 197 casualties, Airborne troops arriving by parachute and glider numbered an additional 14,000 men, with 2,500 casualties. Around 700 men were lost in engineering units, 70th Tank Battalion, Cherbourg was captured on June 26, but by this time the Germans had destroyed the port facilities, which were not brought back into full operation until September. The decision to undertake an invasion of continental Europe within the next year was taken at the Trident Conference. The Allies initially planned to launch the invasion on May 1,1944, General Dwight D. Eisenhower was appointed commander of Supreme Headquarters Allied Expeditionary Force. General Bernard Montgomery was named as commander of the 21st Army Group, on December 31,1943, Eisenhower and Montgomery first saw the plan, which proposed amphibious landings by three divisions and two-thirds of an airborne division. The two generals immediately insisted that the scale of the invasion be expanded to five divisions. The change doubled the frontage of the invasion from 25 miles to 50 miles and this would allow for quicker offloading of men and materiel, make it more difficult for the Germans to respond, and speed up the capture of the port at Cherbourg. Eisenhower and Lieutenant General Omar Bradley selected for Utah the VII Corps, Major General J. Lawton Collins, who had experience with amphibious operations in the Pacific Theater of Operations, replaced Major General Roscoe Woodruff as commander of VII Corps. Utah Beach, the westernmost of the five landing beaches, is on the Cotentin Peninsula, west of the mouths of the Douve and Vire rivers
7.
North Korea
–
North Korea, officially the Democratic Peoples Republic of Korea, is a country in East Asia, constituting the northern part of the Korean Peninsula. Pyongyang is both the capital as well as its largest city. To the north and northwest the country is bordered by China and by Russia along the Amnok, the country is bordered to the south by South Korea, with the heavily fortified Korean Demilitarized Zone separating the two. Negotiations on reunification failed, and in 1948 two separate governments were formed, the communist Democratic Peoples Republic of Korea in the north, an invasion initiated by North Korea led to the Korean War. The Korean Armistice Agreement brought about a ceasefire, and no peace treaty was ever signed. North Korea officially describes itself as a self-reliant socialist state and formally holds elections, critics regard it as a totalitarian dictatorship. Various outlets have called it Stalinist, particularly noting the elaborate cult of personality around Kim Il-sung, International organizations have assessed human rights violations in North Korea as belonging to a category of their own, with no parallel in the contemporary world. Over time, North Korea has gradually distanced itself from the world communist movement, Juche, an ideology of national self-reliance, was introduced into the constitution as a creative application of Marxism–Leninism in 1972. The means of production are owned by the state through state-run enterprises, most services such as healthcare, education, housing and food production are subsidized or state-funded. From 1994 to 1998, North Korea suffered from a famine that resulted in the deaths of between 0.24 and 3.5 million people, and the continues to struggle with food production. North Korea follows Songun, or military-first policy and it is the country with the highest number of military and paramilitary personnel, with a total of 9,495,000 active, reserve, and paramilitary personnel. Its active duty army of 1.21 million is the fourth largest in the world, after China, North Korea is an atheist state with no official religion and where public religion is discouraged. The name Korea derives from the name Goryeo, the name Goryeo itself was first used by the ancient kingdom of Goguryeo in the 5th century as a shortened form of its name. The 10th-century kingdom of Goryeo succeeded Goguryeo, and thus inherited its name, the modern spelling of Korea first appeared in the late 17th century in the travel writings of the Dutch East India Companys Hendrick Hamel. After the division of the country into North and South Korea, the two sides used different terms to refer to Korea, Chosun or Joseon in North Korea, in 1948, North Korea adopted Democratic Peoples Republic of Korea as its new legal name. After the First Sino-Japanese War and the Russo-Japanese War, Korea was occupied by Japan, Japan tried to suppress Korean traditions and culture and ran the economy primarily for its own benefit. Korean resistance groups known as Dongnipgun operated along the Sino-Korean border, some of them took part in allied action in China and parts of South East Asia. One of the leaders was the communist Kim Il-sung, who later became the leader of North Korea
8.
Rifling
–
In firearms, rifling consists of helical grooves in the internal surface of a guns barrel, which impart a spin to a projectile around its long axis. This spin serves to stabilize the projectile, improving its aerodynamic stability. Rifling is often described by its twist rate, which indicates the distance the rifling takes to complete one revolution, such as 1 turn in 10 inches. A shorter distance indicates a faster twist, meaning that for a given velocity the projectile will be rotating at a spin rate. Barrels intended for long, small-diameter bullets, such as the ultra-low-drag, 80-grain 0.223 inch bullets, extremely long projectiles such as flechettes may require high twist rates, these projectiles must be inherently stable, and are often fired from a smoothbore barrel. Muskets were smoothbore, large caliber weapons using ball-shaped ammunition fired at low velocity. Due to the high cost and great difficulty of manufacturing, and the need to load readily from the muzzle. Consequently, on firing the ball bounced off the sides of the barrel when fired, barrel rifling was invented in Augsburg, Germany in 1498. In 1520 August Kotter, an armourer of Nuremberg, Germany improved upon this work, though true rifling dates from the mid-16th century, it did not become commonplace until the nineteenth century. The most successful weapons using rifling with black powder were breech loaders such as the Queen Anne pistol, the grooves most commonly used in modern rifling have fairly sharp edges. More recently, polygonal rifling, a throwback to the earliest types of rifling, has become popular, polygonal barrels tend to have longer service lives because the reduction of the sharp edges of the land reduces erosion of the barrel. Supporters of polygonal rifling also claim higher velocities and greater accuracy, polygonal rifling is currently seen on pistols from CZ, Heckler & Koch, Glock, Tanfoglio, and Kahr Arms, as well as the Desert Eagle. Such guns have achieved significant increases in velocity and range. Examples include the South African G5 and the German PzH2000, gain-twist rifling begins with very little change in the projectiles angular momentum during the first few inches of bullet travel after ignition during the transition from chamber to throat. This enables the bullet to remain undisturbed and trued to the case mouth. After engaging the rifling the bullet is progressively subjected to accelerated angular momentum as burning powder propels it down the barrel. By only gradually increasing the rate, torque is spread along a much longer section of barrel. Gain-twist rifling was used as early as the American Civil War, colt Army and Navy revolvers both employed gain-twist rifling
9.
Allied invasion of Sicily
–
The Allied invasion of Sicily, codenamed Operation Husky, was a major campaign of World War II, in which the Allies took the island of Sicily from the Axis powers. It was an amphibious and airborne operation, followed by a six-week land campaign and was the beginning of the Italian Campaign. Husky began on the night of 9/10 July 1943, and ended on 17 August, the Italian leader, Benito Mussolini, was toppled from power in Italy and the way was opened for the Allied invasion of Italy. The German leader, Adolf Hitler, canceled a major offensive at Kursk after only a week, in part to divert forces to Italy, resulting in a reduction of German strength on the Eastern Front. The plan for Operation Husky called for the assault of Sicily by two Allied armies, one landing on the south-eastern and one on the central southern coast. The amphibious assaults were to be supported by gunfire, as well as tactical bombing, interdiction. As such, the operation required a complex structure, incorporating land, naval. The overall commander was American General Dwight D. Eisenhower, as Commander-in-Chief of all the Allied forces in North Africa, British General Sir Harold Alexander acted as his second-in-command and as the 15th Army Group commander. The American Major General Walter Bedell Smith was appointed as Eisenhowers Chief of Staff, the overall Naval Force Commander was the British Admiral Sir Andrew Cunningham. The Allied land forces were from the American, British and Canadian armies, the Eastern Task Force was led by General Sir Bernard Montgomery and consisted of the British Eighth Army. The Western Task Force was commanded by Lieutenant General George S. Patton, the two task force commanders reported to Alexander as commander of the 15th Army Group. Seventh Army consisted initially of three divisions, organized under II Corps, commanded by Lieutenant General Omar Bradley. Middleton, sailed from the United States via Oran in Algeria, the 2nd Armored Division, under Major General Hugh Joseph Gaffey, also sailing from Oran, was to be a floating reserve and be fed into combat as required. On 15 July, Patton reorganized his command into two corps by creating a new Provisional Corps headquarters, commanded by his deputy army commander, Major General Geoffrey Keyes. The two divisions of XIII Corps, the 5th and 50th Infantry Divisions, commanded by Major-Generals Horatio Berney-Ficklin and Sidney Kirkman and this request was granted by the British, displacing the veteran British 3rd Infantry Division. The Red Patch Division was added to Leeses XXX Corps to become part of the British Eighth Army, in addition to the amphibious landings, airborne troops were to be flown in to support both the Western and Eastern Task Forces. To the east, the British 1st Airborne Division, commanded by Major-General George F. Hopkinson, was to seize vital bridges and high ground in support of the British Eighth Army. The initial plan dictated that the U. S. 82nd Airborne Division, Allied naval forces were also grouped into two task forces to transport and support the invading armies
10.
M3 Half-track
–
The M3 Half-track, known officially as the Carrier, Personnel Half-track M3, was an American armored personnel carrier half-track widely used by the Allies during World War II and in the Cold War. Derived from the M2 Half Track Car, the slightly longer M3 was extensively produced, with about 15,000 units, the design was based on the Citroen-Kégresse half-track. The developers attempted to use as many parts as possible. There were also several variants for different purposes. The M3 and its variants were supplied to the U. S. Army and Marines, as well as British Commonwealth and Soviet Red Army forces, although at first unpopular, it was used by most of the Allies at some point in the war. Racks under the seats were used for ammunition and rations, additional racks behind the seat backs held the squads rifles, a small rack for mines was added on the outside of the hull just above the tracks. In combat, most units found it necessary to stow additional food, rucksacks, luggage racks were often added in the field, and very late vehicles had rear-mounted racks for this crew stowage. Early vehicles had a mount, just behind the front seats. The later M3A1 adopted a raised, armored pulpit mount for the. 50-caliber, many M3s were later modified to the M3A1 standard. The body was armored all around, with an armored shutter for the engines radiator. Between the world wars, the U. S. Army sought to improve the mobility of its forces. With the goal of finding a high-mobility infantry vehicle, the Ordnance Department had evaluated the design by testing French Citroën-Kégresse vehicles. The White Motor Company produced a prototype using their own chassis. The front suspension was leaf spring, tracks by vertical volute spring, braking was vacuum-assisted hydraulic, steering manual, without power assist. The M3 was the larger and longer counterpart to the M2 Half Track Car, the M2 was originally intended to function as an artillery tractor. The M3 had an access door in the rear and seating for a 12-man rifle squad. Five seats were arranged on each side in the rear of the vehicle, although originally intended for armored infantry regiments, it was quickly put into action with the Provisional Tank Group when the Japanese Army began their invasion of the Philippines. Initially, there were multiple complaints due to mechanical difficulties
