A gold color metal and enamel device 1 1/8 inches (2.86 cm) in height overall blazoned: Per bend sinister Tenné and Azure, in dexter chief an open book of knowledge Or, detailed of the field, and in sinister base a winged foot, symbolic of Mercury, of the like, charged in helm a wildcat couped to dexter of the second fimbriated Or, all above a Blue scroll inscribed "ARMSTRONG HIGH SCHOOL" in Gold letters.
Orange and blue are the school colors. The wildcat is the school mascot. The open book alludes to knowledge, and the symbol for Mercury is the winged foot, denoting communication and leadership virtues the cadet's pride in.
The shoulder loop insignia was authorized 17 December 2004.