I'll answer just one of your questions, just to begin to show you how wrong you are.
US Army Divisions using the M1 Carbine as a primary weapon.
1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th mtn., 24th, 25th, NG 26th, NG 27th, NG 28th - 45th, 63rd, 65th, 66th, 69th, 70th, 71st, 75th, 76th, 77th, 78th, 79th, 80th, 81st, 83rd, 84th, 85th, 86th, 87th, 88th, 89th, 90th, 91st, 92nd, 93rd, 94th, 95th, 96th, 97th, 98th, 99th, 100th, 102nd, 103rd, 104th, 106th, Americal, 11th Airborne, 13th Airborne, 17th Airborne, 82nd Airborne, 101st Airborne, 555th Parachute Battalion, 1st Cavalry, 2nd Cavalry.
Not enough? How about the marines that were issued the M1 Carbine?
Please, don't waste my time. I was serious when I said you need to hit the books. You don't even have the mental power to read over this page...