SD2:Tri-Polsten

 is a British Anti-air unit in Steel Division II.

Background
Polsten gun originated from Poland who designers were simplifying the Oerlikon gun. The design was completed by Polish, Birtish, and Czech designers. Various Mounts were used ranging from double to quad mounts. These guns were used by  15th Infantry by 119th (Queen's Own) Light Anti-Aircraft Regiment, Royal Artillery in Troops in each Bofors equipped Battery.