Today in WW II: 28 Nov 1941 Russians retake Rostov as their counter-attacks force German withdrawal.  More 
28 Nov 1943 Roosevelt, Churchill, Stalin meet at Teheran Conference in Iran.
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GMC M221 Truck, Tractor, 2 1/2 ton, 6x6 (G-749)

The M-221 2 1/2 Ton 6x6 Tractor is part of the GMC M-135 Series of Cargo Trucks. More information is found on the linked page.

U.S. Military GMC M221 Truck, Tractor, 2 1/2 ton, 6x6 (G-749), from TM 9-8024
U.S. Military GMC M221 Truck, Tractor, 2 1/2 ton, 6x6 (G-749), from TM 9-8024

U.S. Military GMC M221 Truck, Tractor, 2 1/2 ton, 6x6 (G-749), from TM 9-8024
U.S. Military GMC M221 Truck, Tractor, 2 1/2 ton, 6x6 (G-749), from TM 9-8024