premise: First Motion Picture Unit produced films.
hypothesis: The First Motion Picture Unit ( FMPU ) , later 18th Army Air Forces Base Unit , was the primary film production unit of the US Army Air Forces ( USAAF ) during World War II and was the first military unit made up entirely of professionals from the film industry . It produced more than 400 propaganda and training films , which were notable for being informative as well as entertaining . The unit also produced training films and trained combat cameramen .