US Paratroopers of the 82nd Airborne preparing for a jump on Salerno (Italy) in September 1943. The distinctive color of the parachutist's utilities and the brown jump boots are clearly seen. Note also the CCKW 2 1/2-ton 6x6 transport truck with color bar marking on the door. These color bar coding used as a representation of army unit numbers used for shipping vehicles on a sea voyage (probably because it would be easier to put the vehicles of a certain unit together on the same boat that way, but you see different versions of the bars, with and without a letter next to it).
Book "US Special Forces of World War II" by Leroy Thompson