The 3rd Battalion 7th Marine Regiment (3/7) is an infantry battalion of the United States Marine Corps. They are based at the Marine Corps Air Ground Combat Center Twentynine Palms and consist of approximately 800 Marines. The battalion falls under the command of the 7th Marine Regiment and the 1st Marine Division. The battalion has seen combat in World War II, the Korean War, the Vietnam War, the Gulf War and was a part of the main effort during the initial invasion of Iraq in 2003. During the Global War on Terror, the battalion saw eleven sequential combat deployments; five in support of Operation Iraqi Freedom, three in support of Operation Enduring Freedom, and three in support Operation Inherent Resolve. The unit has a long, decorated history with countless achievements. Its members were described as "true professionals" by embedded reporters during the 2003 invasion of Iraq.

Sangin is a town in Helmand province of Afghanistan, with a population of approximately 20,000 people. It is located on 32°4′24″N 64°50′2″E in the valley of the Helmand River at 888 m (2,913 ft) altitude, 95 km (59 mi) to the north-east of Lashkargah. Sangin is notorious as one of the central locations of the opium trade in the south of the country, and is also a town that has traditionally supported the Taliban. It was described by British newspaper The Guardian as "the deadliest area in Afghanistan" in 2010. Sangin also houses the main bazaar for Sangin District. Route 611 passes through Sangin.