The Tsukuba Space Center (TKSC) also known by its radio callsign Tsukuba, is the operations facility and headquarters for the Japan Aerospace Exploration Agency (JAXA) located in Tsukuba Science City in Ibaraki Prefecture. The facility opened in 1972 and serves as the primary location for Japan's space operations and research programs. Japanese astronauts involved in the International Space Station are trained in part here in addition to the training they receive at the Lyndon B. Johnson Space Center, in Houston, Texas.