Christopher C. Kraft Jr. Mission Control Center
NASA's Christopher C. Kraft Jr. Mission Control Center (MCC-H, initially called Integrated Mission Control Center, or IMCC), also known by its radio callsign, Houston, is the facility at the Lyndon B. Johnson Space Center in Houston, Texas, that manages flight control for America's human space program, currently involving astronauts aboard the International Space Station (ISS). The center is in Building 30 at the Johnson Space Center and is named after Christopher C. Kraft Jr., a NASA engineer and manager who was instrumental in establishing the agency's Mission Control operation, and was the first Flight Director.
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The MCC currently houses one operational control room in Building 30 from which flight controllers command, monitor, and plan operations for the ISS. This room has many computer and data-processing resources to monitor, command and communicate with the station. The ISS control room operates continuously. A second control room in the same building, which formerly hosted the Shuttle flight control team, can be set up for ISS operations should the need arise (e.g., during repairs or hardware upgrades in the main room), and also hosts training simulations.