Analyst Note:
This image shows the MK 136 Third Stage Rocket Motor of a U.S. RIM-161 Standard Missile 3 (SM-3) Blk I interceptor missile. The SM-3 Blk I variants share the same propulsion sections, but have differences in the kill vehicle section. The SM-3 Blk II variants are substantially different, including new, larger-diameter propulsion sections. SM-3 missiles have a booster, dual-thrust rocket motor, third-stage rocket motor, and an altitude control section in the kill vehicle. (ARES)