Well, during WW2, the little film studio PRC (Producers Releasing Corporation) made some REALLY low-budget stinkers. Two I can think of are “They Raid by Night” and “Miss V from Moscow.” Although the latter one is little more espionage-oriented than war genre. Pretty bad stuff, though.
Ha Ha Ha! PRC. My Mom (who worked in a theater) tells me that stood for “Putrid, Rotten, and Crummy”.