SD2:M1A1 155mm Long Tom

 is a United States Artillery unit in Steel Division II.

Background
This Field Gun replaced the World War I era French 155mm GPF. 155 mm Gun M1 was created by Westervelt Board which planned the US Army artillery post Great War. Prototypes were created during the 20s and 30s but financial issues prevented deployment. These were used in the Corps Field Artillery Battalion.