The M-107 entered service with the U.S. Army in the early 1960s, gradually replacing the M53 155mm Self-Propelled Gun. It was developed as the T235 prototype by Pacific Car and Foundry Company (PACCAR, Inc.), standardized as the M107 in 1962. The full nomenclature is Gun, Field Artillery, Self-Propelled: 175-MM, M107 (from TM 9-2300-216-10, Operator's Manual). The M-107 is also sometimes referred to as a howitzer or cannon. The gun itself, mounted on the M107 chassis, is the Cannon, 175mm, M113 fitted to an M158 mount.
The M-107 175mm Self-propelled gun fired a 174-pound projectile almost 33 kilometers. This impressive range made it a valuable weapon for providing an umbrella of protection over large areas. The large spade at the rear is hydraulically operated. When lowered it keeps the vehicle in place as the gun is fired, opposing the massive recoil.
The same diesel powered chassis is used for the M107 and the M110 self-propelled 8in (203mm) howitzer. In Vietnam, the M110 8-inch howitzer was found with most division artilleries, and both the 8-inch howitzer and M107 175-mm. gun were with field force artillery. At field force the proportion of 8-inch and 175-mm. weapons varied. Since the weapons had identical carriages, the common practice was to install those tubes that best met the current tactical needs. One day a battery might be 175mm while a few days later it might be half 175mm and half 8-inch.
Today in WW II: 6 Oct 1939 In a Reichstag speech, Adolf Hitler reveals plans for a Jewish enclave in Poland for millions of Jews from Germany, Poland and other lands, a plan understood as a huge concentration camp. More↓