I asked recently for some information on the equipment carried by US troops in World War 2; the specifics of the kit, how much food, how much ammo, etc. Well, I was sent this link- and it provides information on the equipment carried by Airborne troops during the invasion of Europe.
Here's some info on the ammunition carried-
Rounds per weapon: 136, jumped on individual. (128 in Air Corps pockets, 4 clips per pocket), 1-8 rnd. clip in rifle, hand, or jumpsuit pocket (55% ball, 40% AP, 5% tracer. Rifle belt and one bandolier may be used in lieu of the above. 60 Riflemen per company will jump with 1 belt of LMG ammunition (250 rounds); this may be used in M-1 rifles if the situation warrants.
Rounds per weapon: 175, jumped on individual. 160 in 2 Air Corps pockets (2 clips and one box per pocket), 15 in hand (1 clip) or jumpsuit pocket (100% ball)
Rounds per weapon:300, Jumped on individual. 14 (20 rnd) clips in jump suit pockets or M6 carrying bag, 1 clip in gun, hand, or jumpsuit pocket.
Rounds per weapon: 145, jumped on individual. 140 in four Air Corps pockets (7 clips per pocket), 1 5 rnd. clip in rifle, hand, or jumpsuit pocket. The '03 rifle may not be used if launcher for M-1 rifle is issued. It is now a superimposed weapon and if jumped will have to supplant the primary weapon of the man jumping it.
There's also info on the exact kit they took.