 Soon after the Normandy invasion in June 1944, General Dwight D. Eisenhower urgently requested heavy tanks, but McNair's continued opposition to mass production due to persistent serious mechanical problems with the vehicles delayed their procurement.That same month, the War Department reversed course and completely overruled the Army Ground Forces when making their tank production plan for 1945.7,800 tanks were to be built, of which 2,060 were to be T26s armed with 90 mm guns, 2,728 were to be T26s armed with 105 mm howitzers, and 3,000 were to be M4A3 Sherman tanks armed with 105 mm howitzers.