The M3 Lee was an American tank. The M3 saw the North African Campaign along with limited use in the Pacific Theater. (Where it was said to be used, although it was said to be obsolete, until the end of the war in the Pacific.) The M3 hull was used for SPGs, recovery vehicles, and the Canadian Ram Tank. (The Ram was used as a trainer and didn't see combat.)
Specs:
Weight: 27 tons
Length: 18ft 6in
Height: 10ft 3in
Width: 8ft 11in
Armor: 51mm
Armament:
1x 75mm Gun M2/M3 in hull (46 rounds)
1x 37mm Gun M5/M6 in turret (178 rounds)
2-4 .30-06 Browning M1919A4 machine guns with 9,200 rounds
Engine: Wright (Continental) R975 EC2 400 hp
Transmission: Synchromesh, 5 speeds forward, 1 reverse
Suspension: vertical volute spring
Ground Clearance: 18in
Fuel Capacity: 175 gallons
Range: 120mi
Crew: 7
Speed: 26mph on road and 16mph off road
Steering: controlled differential
The M3 can fill some gaps. The M3 can helpful for the EW. The PanzerIII can be added along with the M3 Lee. The M3 Lee's 75mm gun can be slaved to the turret like the hull MG is currently or be another gunning position. The 37mm was aimed with an M2 periscope. The periscope also aimed the coaxial machine gun. The 75mm gun was aimed with an M1 periscope with an integral telescope on the top of the sponson. The 37mm gun's sight was marked from 0-1,500 yd. The 75mm gun's sight was marked from 0-3,000 yd (vertically marked). The coaxial machine gun was marked from 0-1,000yd.