Rockot/Briz-KM was the operational configuration of the Rockot launch system. It combined the two liquid-propellant stages of a converted UR-100N/SS-19 missile with Khrunichev's wider, restartable Briz-KM upper stage. Thirty-one vehicles flew from Plesetsk between 2000 and 2019 for commercial, civil, scientific, and Russian federal missions.