{| |} The BAE Systems SkyEye is a reconnaissance UAV developed in the United States in the early 1970s by Developmental Sciences Inc, later called Developmental Sciences Corporation, a division of Lear Astronics Corporation and ultimately part of BAE Systems. Developmental Sciences was one of the first US companies to investigate battlefield UAVs, flying the first prototype of the SkyEye series in 1973, leading to the first flight of the improved R4E variant in 1981. The R4E has been continuously refined since then in a sequence of subvariants.