When I first got to my unit in 02, we had the 7-D's, never saw a 7-B, by 2004 I never saw another 7-D in an infantry platoon, we had switched completely to the 14's, of course some of the other units around had older stuff. Saw some support units that had the old 7A's. So some units will have really old hand-me-downs, but for the most part, active duty infantry will get the newer cooler toys.