Today in WW II: 20 Feb 1942 Navy Lt. Cdr. Edward 'Butch' O'Hare of Chicago becomes America's first World War II flying ace. Chicago expanded old Orchard field in 1946, renaming it for O'Hare.  More 
20 Feb 1944 Operation Argument aka 'Big Week' begins; American bombers concentrate on German aircraft manufacturing to lure the Luftwaffe into a decisive battle.
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M-50 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal.

The Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal. M-50 is part of the G-742 (or M-44) series of 2 1/2 ton trucks. The many models of the very successful G-742 trucks were in Army inventory from the mid-1950s into the 1990s.

Details of the history, model numbers, and configurations of the M35-series of 6x6 cargo trucks is on the linked page.

There were at least two body styles for the tank of the M50 family of water trucks. Note that one style has a rectangular wheel well while the other has a straight body side, both found in other trucks of the M-44 series.

A Marine at the controls of an M-50 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., April 1983.  A water tank trailer is to the left.
A Marine at the controls of an M-50 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., April 1983. A water tank trailer is to the left.

6th Marine Amphibious Brigade M50 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., Wilmington, NC, 15 March 1985.  The truck is on the ramp of prepositioning ship SS PFC. Eugene A. Obregon (T-AK 3006)
6th Marine Amphibious Brigade M50 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., Wilmington, NC, 15 March 1985. The truck is on the ramp of prepositioning ship SS PFC. Eugene A. Obregon (T-AK 3006).

U.S. Army M50A3 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., Langley AFB, VA, 28 March 1985
U.S. Army M50A3 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal., Langley AFB, VA, 28 March 1985.

U.S. Army M-50A3 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal. filling from a desert well station during Exercise Gallant Eagle '86, Twentynine Palms, CA, July 1986.
U.S. Army M50A3 Truck, Tank, 2 1/2-ton, 6x6, Water, 1000 gal. filling from a desert well station during Exercise Gallant Eagle '86, Twentynine Palms, CA, July 1986.