I might also throw in a comment that in most armies, it was apparently necessary to carry belted machine gun ammunition draped around one's neck or around your body bandolier fashion. Only recently does alternative methods seem to be used. In some armies, when magazine-fed light machine guns were introduced, additional magazines were democratically distributed throughout the squad or section so that the burden was (in theory) spread out more as well as allowing more ammunition to be carried for what was thought of as the most important weapon of the squad. That was not done in American practice, though, and the BAR man had a real load.
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.