Graphite-Epoxy Motor
The Graphite-Epoxy Motor is a family of solid rocket boosters developed in the late 1980s and used since 1990. GEM motors are manufactured with carbon-fibre-reinforced polymer casings and a fuel consisting of HTPB-bound ammonium perchlorate... Wikipedia
First flight: 26 November 1990
Manufacturer: Hercules; Alliant Techsystems; Orbital ATK; Northrop Grumman Space Systems