1946 6 45 The missile is driven by a solid-propellant rocket unit.
1961 80 756/1 When the satellite reaches the 22,300 mile apogee of the trajectory..the solid-propellant apogee motor will be used to inject the satellite into a circular, near-synchronous orbit.
1982 Mar. 18/3 The missiles would be accelerated from rest by two solid~propellant boosters.