This is the latest model of the M109A7 " Paladin", first put in service in 1963 and has been used in Vietnam, Yon Kippur war, Desert Storm, Iraq war and now in Ukraine. It is a 155mm self-propelled howitzer with a 38Km range at present, but it will soon have a new cannon with rocket assisted shells which should give it a range of over 70Km, which means it may remain in service until the 2060's and just like the B-52, the M2 .50 caliber machine gun and the 1911 A1 .45 Caliber gun, become another centennial weapon since the replacements are simply not that much better.