Comparing: T82 HMC vs. Birch Gun

SPG on the M5A1 chassis designed for jungle warfare. The vehicle featured a 105 mm light howitzer mounted in an open-topped cabin. Development started in November 1943. In August 1944, two prototypes underwent trials on the Aberdeen Proving Ground. On June 21, 1945, the project was discontinued due to the lack of interest in vehicles of this type.

In the 1920s, British engineers explored the idea of an SPG on a tank chassis. Development of the vehicle started in 1923 at the Royal Arsenal, Woolwich. It was based on the Vickers Medium Mark II, the chassis of which could carry the required modules. A total of seven prototypes were manufactured and joined the Experimental Mechanised Force established on May 1, 1927. Later, the unit was disbanded, along with the SPG program.