English: A repaired M3 medium tank is given final check by Ordnance personnel. Every tank, gun, or vehicle, damaged either by an accident or later in combat, which could be repaired meant one less new tank to be supplied. As the war progressed the medium tank underwent changes as did a great deal of other U. S. equipment. It became lower so as to present a more difficult target, the riveted hull was replaced by a welded or cast hull, and toward the end of the war the suspension system was changed. These, and other mechanical changes, with the addition of better armament and armor, made the vehicle a more formidable fighting machine, better able to combat enemy tanks.