Halo has an ideas thread why not COD, here's a few of my ideas:
1) MiG 29 (MiGs are mentioned and rarely seen in the game and I picked the 29 cause it looks better than the 31 in my view and if the harrier gets made why not a MiG?) same figures as the harrier maybe with a repaint.
2) Predator drone (The dome drone is a Reaper not a predator) basically the same sort of thing but the rear wings are inverted (except the central wing that stays in the same place as the reaper) figure(s): I have no idea
3) T-80 or a T-90 (externally theyre almost identical) figures 2-3 tank crew perhaps a good idea would be to introduce a new AKS-74 barrel with the conical muzzle
4) Striker personnel carrier (any variant will do) 3-5 crew/troops
5) MLRS or HIMRAS (MLRS is the 12 Missiles, HIMRAS is the 6 Missles)
6) BM-21 rocket launching truck (I think it's like 15 missiles? Probably more), 2 crew
LEGENDS ideas:
Since it seems to only be allies (Americans) why not expand to other countries involved in WW2 (now I know people will probably hate on the Germans saying this and that but not every German was involved in the bad things)
German:
1) German troop pack - 4 German soldiers (maybe one medic) introduce STG44 and MG34 or the MG42
2) Panther tank - 3 tank crew introduce MP-40
3) SDKFZ 222 (armored car) - 1 crew, 1 German soldier
UK
1) Cromwell tank - 3 crewmen introduce sten gun
2)Bren gun carrier - 1 crew, 3 troops introduce Bren gun and Lee Enfield mk.4 (?)
3)UK troop pack (4 British Soldiers)
4) QF 6-pounder Anti-Tank gun, 2 soldiers