During WWII, 93% of the United States Army was Draftees.
It was a magnificent fighting force, in Europe, North Africa and the Pacific, and in all forms of operations, including amphibious, conducting the largest, and the most, amphibious landings in all theatres, and also conducting Airborne operations in Europe and in the Pacific.
The Army continued using Indian Wind-talkers as radio operators, a practice they started in WWI, and in WWII continued their use in all theaters of the war, the Pacific, Europe, and North Africa.
Your numbers are in fact wrong.
Profile of US Servicemen (1941-1945)
38.8% (6,332,000) of U.S. servicemen and all servicewomen were volunteers
61.2% (11,535,000) were draftees
Average duration of service: 33 months
Overseas service: 73% served overseas, with an average of 16 months abroad
Combat survivability (out of 1,000): 8.6 were killed in action, 3 died from other causes, and 17.7 received non-fatal combat wounds
Non-combat jobs: 38.8% of enlisted personnel had rear echelon assignments—administrative, support, or manual labor.
Average base pay: enlisted—$71.33 per month; officer—$203.50 per month