Have Guns, Will Upgrade: The M109A7 Paladin PIM Self-Propelled Howitzer

http://www.defenseindustrydaily.com/have-guns-will-upgrade-the-m109a6-paladin-pim-partnership-04039/

The USA's 155mm M109 self-propelled howitzers (SPH) were first introduced in 1962, as a form of armored mobile artillery that could stand up to the massed fire tactics of Soviet heavy artillery and rockets. They and their companion M992