I dunno man, personally I would not go double MGs on a corridor map vs commando regiment with the scout and sprint ability and section grenades. That's just asking to lose the MG.
Forget about T0 call in infantry, rifles are superb now. Go 3 rifles into Captain, then abuse his supervise for building and upgrading. Get an early AT gun vs okw or an AAHT vs Ostheer. Get a pack if opponent is static. Get weapon racks around 7-9 mins and BAR your 3 rifles and your rear echelons. Get Major and an elite infantry unit if your doc has it, then go M4A3 and a 2nd AT gun.