I was 5' 10 inches tall and we were told, you get 3 square meals a day and no opportunity for snacks {at least for a while}. I ate good, got 8 hours of sleep a day except when I had dorm guard duty and my shift was 2:30 A.M - 4:30 A.M {Ouch!!!}.
Unless I'm mistaken,Airmen get training that's more focused on technology (computers,engines,etc,etc) whereas an Army "grunt" marches (or runs) with 40 pounds on his back and an M-16 on his shoulder.Fixing an aircraft engine,for example,is just as important as being a rifleman,IMO.
I *do* wish,however,that we were able to get 8 hours of sleep a night.We were lucky to be in the rack at 23:00... and reveille was at 04:30.
We did get to sleep on Sundays,though!