Other weaknesses include: poor location of the engine in the hull, which leads to inconvenience during removal and repair, poor gearbox and differential construction, joined in one unit (M3 light) or located inside the tank hull (M3 medium), poor reliability and frequent breakdowns of Browning machineguns, lack of HE shells for the 37 mm gun (M3 light and M3 medium).
American tanks can be used in:
- An echelon during a breakthrough, accompanies by KV and T-34 tanks.
- In pursuing a retreating enemy, and fighting his mobile defenses.
- A sudden attack on a weakly fortified enemy.
- During a defense, from ambushes.
From the same officer, "Report on combat use of American tanks (M3 medium and M3 light)".
"...The tanks easily catch fire when shot. For example, during the operation on July 5th, 1942:
- Out of 31 M3 lights, 24 burned.
- Out of 14 M3 mediums, 14 burned.
- Out of 30 M3 lights, 22 burned.
- Out of 14 M3 mediums, 12 burned."