If any Infantry players are interested in the GMC 75mm, it is nearly identical to the LeIG as far as AI ability, but it has 10 range less (50) and does far more damage on a direct hit (90 compared to 60).
It's cost and platform make it a pretty good unit.
I was actually thinking about that AMPM.
Another interesting fact about US Inf is that it's the perfect counter to Battle Hardened. Since soldiers with elite armor actually take MORE damage from flamethrowers, just one officer and a few engineers can roast any grenadier or storm trooper with the help of a single bar squad to suppress.
CHOSEN UNLOCKS: Triage (duh), MI, Rangers, Howitzer/officer, Jumbo
REASONING: Bars > greaseguns, A little rangers go a long way, howitzers are fun, jumbos are more fun