Infantry-only Tactics and Help?

[Imp]

M2s put up on a ridge or hillside are great supression tools, they have a huge advantage in range over the .30 cal weapons, and better bang for the buck then 60mm mortars.

Not strictly true, long range small mortars like the USAs are great, very high rate of fire & hence suppresion plus you can use them with your troops nearby as they dont kill things often. If you want suppresion great tools, if you want to kill something buy a big gun or rockets. They are great for clearing out woods villages etc where your troops are in proximity.