155mm M109A2 SP

The M109A2 is an American 155mm self-propelled howitzer, an upgraded variant of the M109 series. It features an improved M185 cannon, increased ammunition storage, and enhanced reliability compared to its predecessors.

Developed in the mid-1970s under the Product Improvement Program, the M109A2 was designed to address reliability and maintainability issues identified in earlier M109 models during the Vietnam War era. Entering production in 1977 and officially joining U.S. Army service in 1979, it introduced standardized safety and mechanical upgrades directly from the factory floor. The platform saw extensive combat during the 1982 Lebanon War with Israeli forces and during the 1991 Gulf War, proving to be a highly effective fire support asset. Although phased out of front-line U.S. service by newer variants like the M109A6 Paladin, the M109A2 remains in active service with several international militaries and established the baseline standard for modern self-propelled howitzer design.