Frickin' Legion of Superheroes, essentially, but in WW2.
I started off with issue 9 in 1982 - I was 13! Missed a lot of the early issues and I'm thinking about tracking them down.
The writer was Roy Thomas, who coind the term "retcon" because of his efforts to create reasons for changes to characters back in the 1940s (in the 1940s, the writers didn't care obviously and just did random stuff for no reason). Thus, he provided explanations as to why Dr Fate suddenly had half a helmet with his face exposed, and with different powers; why the Atom, Tarantula, and the Sandman changed uniforms; how the 1970s short lived miniseries set in the war called Steel integrated into the 1940s continuity; why Starman reconquered the Aluetian Islands from the Japanese (it was actually a dream created by Brainwave) and so on.
Probably the biggest explanation was why the JSA/All Star Squadron just didn't invade Germany and Japan (Hitler had a mystic weapon, the Spear of Destiny, that would corrupt heroes with magical powers (or in the case of Superman, suspectibility to magic).
Jerry Ordway was the artist for the first two years, and this was at a time when the man was at the height of his powers (his more recent work has been pretty sloppy) and so the art is really very nice. Around the same time Don Heck took over from George Perez on JLA on the art. Heck is a terrible artist. The comparison between the art of Squadron and the art of the flagship JLA title was striking.
