1943 U.S. Army Air Forces training film, TF 1-3743, 24's Get Back.
Some of the B-24's in the film:
Big Fat Mama
T'ings Is Tuff
Description at the National Archives: "This film presents a look into the effectiveness of the B-24 Liberators and the men who flew them. The film highlights the ability of this particular bomber to withstand punishment, and be brought back to safety by its pilot and crew."