U.S. night camo, fishtail parka. The print idea behind this camouflage was with a view to deceive I.R. night vision equipment. Many traditional camouflages have charcoal mixed in with the pigments to absorb I.R. at different levels to camouflage against night vision equipment. Although these print recipes are guarded with secrecy the actual concept was experimented with by the Germans in WW2.