When talking about officers, it is really only the LT and the CPT that are problematic. Relic doesn't want officers removed or made optional, so it becomes a little harder to work with.
People have already touched upon it, but one of the big issues of USF is that at T0, there is nothing to build but RE and riflemen, leading to people wanting to build riflemen. However, at their price and performance, 2 riflemen + officer is too little, and 3 riflemen + officer is too much in many cases. I would recommend:
1) Keep the LT the same (basically a rifle-squad with smoke and an smg), but decrease his build time so he comes out and can take the place of the 3rd riflemen squad. I would also see the M20 and Stuart moved from being in the same tier, maybe by swapping stuart and pak howie.
2) Make the Captain part of a 4 man team that works like a frontline officer from the other factions. Remove access to the supervise production ability, replace with an ability that either makes riflemen harder to hit, or maybe affects vehicles in some way.
3) Major can stay the same, give him supervise production to reinforce that he is more of a backline officer.
It will be hard to fix USF, but I think this should get it close. I would also like to see a non popcap medic option, maybe allow players to buy base medics like SOV.
Good ideas but...
Captain should stay at 5 men, in my opinion.
Love the Major suggestions, he really should have supervise when he isn't using his abilities in the field.
No need to swap the units yet again and leave Captain with only an ATG to offer, as I doubt we will see both Halftrack and Stuart in the same build.
Also give the LT a Snare by default, please.