Telemetry is used by manned or unmanned spacecraft for data transmission. Baikonur is fully equipped with facilities for launching both manned and unmanned spacecraft. Alpha Centauri is a likely first target for manned or unmanned interstellar exploration. Four manned descents and three unmanned descents have been achieved. Operations had the manned MH-60R working together with the unmanned MQ-8B. The concept is a tailless twin-engine stealth fighter available in manned and unmanned configurations. They can be found on both manned and unmanned craft. GSFC is a major U.S. laboratory for developing and operating unmanned scientific spacecraft. Mars has been explored by unmanned spacecraft. This was based on temperature profiles from mostly unmanned and a few manned instrumented balloons. GSFC is a major US laboratory for developing and operating unmanned scientific spacecraft. The AMCA will be capable of operating in manned as well as in unmanned modes. In 2012, the police began using drones also known as Unmanned Aerial Vehicles. The military role of unmanned aircraft systems is growing at unprecedented rates. The Russian military plans on purchasing additional Israeli unmanned aerial vehicles.