 Orbital was awarded their contract for the development of the Coyote SSST in June 2000.The Coyote is initially boosted by a Hercules MK-70 booster, of similar design to those used by the now obsolete RIM-67 Standard ER missiles.After the booster stage is expended the missile switches to an Aerojet MARC-R-282 solid-fuel rocket /ramjet engine for sustaining its flight.