Air superiority blue color
The source of PRU Blue/Air Superiority Blue colour is Federal Standard 595, a U.S. Federal Government standard set up in 1956 for paint colours, which is mostly used by military contractors and also in engineering. Air superiority blue is designated as Federal Standard 595 colour #FS 15450.
Colour coordinates
Hex triplet #72A0C1
RGB (r, g, b) (114, 160, 193)
CMYK (c, m, y, k) (41, 17, 0, 24)
HSV (h, s, v) (205°, 41%, 76%)
Photographic Reconnaissance Unit (PRU) Blue was devised by the RAF during WW II as a low visibility camouflage colour for its high-flying Spitfire and Mosquito reconnaissance aircraft.
As “air superiority blue” it was then adopted by the US Army Air Force and was added as one of the colours when the Federal Standard 595 colour list was set up in 1956. This colour is used as camouflage by being painted on the bottom sides of reconnaissance aircraft to make them less visible from the ground.
Source From Wikipedia