Here are some fun, not too playtested ideas I’ve been brainstorming. Doesn’t add a ton of flexibility/flavor to the game (the existing unit set is pretty solid), but neither do cruisers, tac bombers etc,
Marines Cost 5 (US Japan? only)
1/2 Attack during amphibious invasions at 2, with artillery 3
Self Propelled Anti Tank Gun (SPATG) Cost 5
2/3 move 2, fires first strike on defense (one unit only), hitting armor first if it exists
Self Propelled Artillery Gun (SPAG) Cost 5
2/2 move 2, combos with mechs/inf as artillery
Escort Carrier Cost 11
0/2 move 2 takes only 1 hit carries only 1 plane
Attack Transports (naval unit) Costs 10
1/1 move 2 carries 3 infantry blocks movement
Strategic Bomber Cost 13 (undercosted)
Cruiser Cost 11 (overcosted)
3/3 move 2 bombards at 3
Banzai Trooper Japan only Cost 4
1/2 move 1 sacrifice during the defense to make them first striking
Cossack Trooper USSR Japan Mongolia only Cost 3
1/1 move 2 can only be produced 1 per controlled “horseman” territory (eg Mongolia, Caucasus, Soviet Far East), place without factories directly on “horseman” territories
Armed Merchant (naval unit) Cost 6
1/1 move 2 carries 1 unit can amphib
Destroyer Cost 8 (Japan UK only?)
2/2 move 2 can carry 1 infantry cannot amphib