Royal Canadaian Artillery: Heavy Artillirty based with the M7 Priest. Different modes, such as Overwatch, creeping barrage, and counter battery fire.
Royal Commandos: Glider SAS troops + Tetrach I light tanks. Abilities to see through FoW, intercept Axis ‘messages’, decoys for artillery and glider drops. (Fake coloured smoke?)
Royal Engineers: Churchill tank variants. 290mm mortar, Flamethrower, cover for tanks, trenches, machinegun nests.
Germans
Scorched Earth: Ability to make impassable terrain, enviornment based defenses.
Luftwaffe: Fallshirmjagers, Flak Cannons, He129 Tank buster.
Tank Hunters: King Tiger, JagdPanther.