m109a3gn/a4/a5oe/a6/l (estimated)

The M109 is an American 155mm self-propelled howitzer, serving as a primary indirect fire support system for many armies worldwide. It has undergone numerous modernization programs, including the A3, A4, A5, and A6 Paladin variants, which enhance its firepower, range, and operational capabilities.

Developed in the late 1950s to replace the aging M44, the M109 entered service with the United States Army in 1963 as a highly mobile, armored artillery platform designed for mechanized warfare. The platform saw its combat debut during the Vietnam War and subsequently became a cornerstone of Western artillery, seeing extensive action in the Gulf War, the War in Iraq, and the ongoing conflict in Ukraine. National modernization programs yielded specialized variants, such as Norway's M109A3GN, Austria's M109A5Ö, and the heavily upgraded American M109A6 Paladin, which introduced advanced digital fire control and survivability enhancements. Today, the M109 family remains one of the most widely produced and combat-proven self-propelled howitzers in history, continuing to serve as a primary fire support asset for dozens of nations.