USMC FROG Desert MARPAT Combat Shirt patchstickers these feature an FR material

these feature an FR material on the camouflaged ripstop fabric areas

but you basically stuff them in the cheeks and screw in the inhale valves from the outside

Almost immediately after being introduced during the Vietnam War

they were most likely for civilian contractors (and they look a whole lot like the blackwater 'fishing vest' color

USMC FROG Desert MARPAT Combat Shirt patchstickers these feature an FR materialMARPAT may be one of the most interesting stories in the rather special history of the United States Marine Corps. Developed out of a field of potential camouflage applicants that included both tiger stripe and brush stroke (yes that brush stroke). MARPAT was the CADPAT inspired camouflage that took the USMC into the digital age. At least as far as their camouflage goes. And as an added bonus this MARPAT is also a little froggy. 'FROG' in this case