Today in WW II: 4 Jun 1939 German ship MS St. Louis denied permission to land in Florida with its 907 Jewish refugee passengers. Ship returns to Europe where passengers die in Nazi death camps.  More 
4 Jun 1940 Neuengamme concentration camp, near Hamburg, Germany becomes autonomous, no longer a sub-camp of Sachsenhausen.
4 Jun 1942 Reinhard Heydrich dies from wounds sustained from 27 May assassination attempt [Operation Anthropoid].
4 Jun 1944 Allies enter Rome the first Axis capital city to fall [4-5 Jun].
4 Jun 1944 German submarine U-505 captured, the first time a US Navy vessel has captured an enemy vessel at sea since the 19th century.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639)

The Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639) was a specialized tractor for towing ponton trailers loaded with bridge sections. The Mack NJU-1 was powered by the Mack EN532 6 cyl., 136hp engine, with 532 cu. in. displacement. The wheelbase was 148 inches, width 96 in., length 237 in. and height 114 in. The maximum lowed load was 30,000 lbs. The box behind the cab was for stowage of tools and equipment related to bridge erection duties.

See also the very similar Autocar U-8144-T Ponton Tractor.

Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639)
Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639).

1941 photo of Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639)
1941 photo of Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639).

Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639) with ponton trailer
Mack NJU-1 Ponton Tractor, 5-ton, 4x4 (G-639) with ponton trailer.

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