Making of Iron Brigade
Iron Brigade was prototyped as part of Amnesia Fortnight, where it was pitched by Project Lead Brad Muir as "Trenched", a name that stuck around right through launch... until it turned out the trademark could not be secured, resulting in a delayed release in Europe and an eventual global name change. We still call it Trenched when no one is looking.
The game's art style is inspired by men's magazines of the 1940s and '50s, which illustrated "the sense of adventure, bravery, camaraderie, drinking, and good old-fashioned face-punching violence" or so says Brad in this sentence we stole directly from Wikipedia, so who really knows for sure.