Studebaker / Reo US6 2 1/2 Ton 6x6 Cargo Truck
The 2 1/2 ton 6x6 truck (the "deuce and a half" or just "deuce") was one of the logistical innovations that helped the Allies win World War II. The full story about the deuce trucks, including the World War II vintage Studebaker & Reo US6 Cargo Truck, is found on the linked page.

Studebaker US 6 6x4 tractor with trailer, Persian corridor, March 1943. A U.S. Army truck convoy carrying supplies for Russia is about to start as the leader checks with the first driver.
Studebaker US-6 2 1/2 Ton 6x6 Cargo Truck (G-630)
Studebaker US-6 2 1/2 Ton 6x6 Cargo Truck (G-630) Closed cab.
Rare soft top US6, with machine gun ring mount. Registration number USA W-459565.
Closed cab US6.
Closed cab US6 fuel truck.
Factory condition, unrestored Studebaker US6 photographed in 2006. Photo courtesy Marion Reeves, eBay seller us6jxd.
Factory condition, unrestored Studebaker US6 photographed in 2006. Photo courtesy Marion Reeves, eBay seller us6jxd.
Cab interior of factory condition, unrestored Studebaker US6 photographed in 2006. Photo courtesy Marion Reeves, eBay seller us6jxd.