The M109, is an American 155 mm turreted self-propelled howitzer, first introduced in the early 1960s to replace the M44 and M52. It has been upgraded a number of times, most recently to the M109A7. T
M109A6
M109 at the Museum of Military History, Vienna
Early M109 howitzer of the Royal Netherlands Army
M109 howitzers belonging to 4th Battalion of the 3rd Field Artillery Regiment, 2nd Armored Division (FWD) conducts artillery strikes on Iraqi positions during the Gulf War
The XM2001 Crusader was to be the United States Army's next-generation self-propelled howitzer, designed to improve the survivability, lethality, mobility, and effectiveness of the artillery as well a
M109 howitzer
…the German PzH 2000. Upgrades to the M109 were introduced by the U.S. (see variants) and by Switzerland (KAWEST). With the cancellation of the U.S. Crusader, non-line-of-sight cannon and M1299, the M109A6 ("Paladin") will likely remain the principal self-propelled howitzer for the U.S. until a replacement…