Christopher C. Kraft Jr. Mission Control Center

• 1. Introduction

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  The Christopher C. Kraft Jr. Mission Control Center in Houston, Texas, is the room where human spaceflight history was made. Its radio callsign is simply "Houston" - the single word that connects Earth to astronauts orbiting two hundred miles above it. From this building at the Lyndon B. Johnson Space Center, flight controllers have guided crewed missions from the early 1960s to the present day, spanning Mercury, Gemini, Apollo, Skylab, the Space Shuttle, and now the International Space Station and the Artemis missions back to the Moon.

  But the facility we know today was not always in Houston. Before astronauts could radio "Houston, we have a problem," Mission Control operated from a building in Florida that no longer exists. The consoles that flight controllers once used to monitor the first Americans in space were eventually dismantled, refurbished, and moved to a museum recreation. The original structure was demolished in May 2010, a victim of asbestos and the corrosive power of salt air.

  Why does Mission Control operate from Houston at all? How did a room on the third floor of Building 30 become one of the most consequential workplaces in American history? And what does the constellation of controller positions - call signs like FLIGHT, CAPCOM, RETRO, and GUIDO - actually mean? Those are the questions this documentary will answer.

• 2. Cape Canaveral Origins

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  Before Houston, there was Florida. From 1960 through 1965, all Mercury-Redstone missions, Mercury-Atlas missions, the uncrewed Gemini 1 and Gemini 2, and the first crewed Gemini mission, Gemini 3, were controlled from the Mission Control Center at Cape Canaveral Missile Test Annex. Until 1963, it was called the Mercury Control Center.

  This original facility sat in the Engineering Support Building at the east end of Mission Control Road, about half a mile east of Phillips Parkway. It was a modest room by later standards, reflecting the relative simplicity of the Mercury capsule itself. The capsule's design was straightforward enough that the control room needed only three rows of consoles, and Mercury missions lasted no more than 35 hours.

  Mercury and Gemini launches were conducted from separate blockhouses at Cape Canaveral. The control center's role was to oversee everything once the rocket cleared the pad. Christopher Kraft himself held the flight director position during Mercury, making him the man with final authority over every orbit-entry and mission-abort decision. His console was the only one in the room equipped with a television monitor, giving him a direct view of the rocket lifting off from the launch pad.

  For the 22-orbit Mercury 9 mission, the workload grew demanding enough that John Hodge joined the flight director ranks. Hodge was an Englishman who had come to NASA after Canada cancelled the Avro Arrow aircraft project. His arrival allowed Kraft to divide Mission Control into two shifts for the longest Mercury flight.

  The Cape facility's final years were not kind to it. After the MCC moved to Houston, the Florida building fell into disuse. It was placed on the National Register of Historic Places, recognizing its role in America's first human spaceflight missions. But recognition could not protect it from the effects of four decades of salt air, and the estimated five-million-dollar repair bill proved too steep. The building was demolished in May 2010. Before it came down, the control room consoles were removed, refurbished, and relocated to a recreation of the room at the Debus Center within the Kennedy Space Center Visitor Complex.

• 3. The Houston Rooms

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  In June 1965, Mission Control moved into Building 30 at what was then called the Manned Spacecraft Center in Houston, a facility that would not be renamed Johnson Space Center until 1973. The first mission controlled from Houston was Gemini 4.

  The new building housed two Mission Operation Control Rooms, known as MOCRs (pronounced "moh-ker"). These rooms were larger and more sophisticated than the single Cape facility. Each was arranged as a four-tier auditorium, with different rows staffed by controllers responsible for different spacecraft systems. A large map screen dominated the front of the room. For most missions, that screen showed a Mercator projection of the Earth, with tracking stations marked and a three-orbit sine-wave track showing the spacecraft's path. Apollo lunar flights required a different display.

  MOCR 1, on the second floor of Building 30, handled Apollo 5, Apollo 7, the Skylab missions, and the Apollo-Soyuz Test Project. MOCR 2, on the third floor, took on all other Gemini and Apollo Saturn V flights except for Gemini 3. It was in MOCR 2 that controllers guided Apollo 11 to the first crewed Moon landing, an event significant enough that the room was designated a National Historic Landmark in 1985.

  MOCR 2's last active use came in 1992, when it served as the flight control room for STS-53. After that mission, the room was converted back toward its Apollo-era configuration and preserved. In January 2018, the first consoles were removed and shipped to the Kansas Cosmosphere for archival cleaning and restoration to Apollo-era condition. On the 1st of July 2019, the restored Apollo-era Mission Control reopened to the public after a two-year effort. Restorers tracked down period-appropriate details including cigarette packs, ashtrays, wallpaper, and carpeting. The room is now accessible through the tram tour at Space Center Houston, though visitors view it from behind glass in a restored gallery.

  In July 2010, air-to-ground voice recordings and film footage from Apollo 11's powered descent and landing were re-synchronized and released publicly for the first time. That audio was later incorporated into an audio-visual presentation created for the 2019 restoration.

• 4. The Language of the Trench

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  "The Trench" is what Apollo-era RETRO controller John Llewellyn called the front row of the Houston MOCR. Flight Director Eugene Kranz said the nickname reminded him of the firing range during his years as a U.S. Air Force officer. The front row was home to BOOSTER, RETRO, FIDO, and GUIDO - controllers who monitored trajectory and handled course changes, and whose work was most intense during launch and re-entry.

  Each position in Mission Control carried a specific, non-negotiable responsibility. CAPCOM, always an astronaut, was normally the only controller permitted to speak directly with the crew in flight. The exception was the Flight Surgeon or the Flight Director, and only in an emergency. Gene Kranz held the PROCEDURES position during Mercury, handling the writing of all mission milestones, go/no-go decisions, and countdown synchronization. He also managed teletype communications between the MCC and the worldwide network of tracking stations and ships.

  The BOOSTER controller's job had a defined endpoint: once the launch vehicle was jettisoned, the controller vacated the console. During Mercury, the BOOSTER was either an engineer from the Marshall Space Flight Center (for Mercury-Redstone flights) or an Air Force engineer (for Mercury-Atlas and later Gemini-Titan flights). During the Gemini program, the position was staffed jointly by an engineer from Martin Marietta and an astronaut. From Apollo 7 onward, engineers from Marshall Space Flight Center handled it.

  Beyond the Trench, specialized controllers tracked mission-specific hardware. During Project Gemini, two Agena controllers monitored the Agena upper stage, which served as a docking target for missions from Gemini 8 through Gemini 12. For Apollo lunar flights, TELMU and CONTROL watched over the Lunar Module. During Skylab, the EGIL controller (pronounced "eagle") monitored the station's solar panels, while a separate EXPERIMENTS controller handled the science instruments in the Apollo Telescope Mount.

  The back row of the Houston MOCR was not for working controllers. It was reserved for NASA management: the director of the Johnson Space Center, the director of flight operations, the director of flight crew operations, and a Department of Defense officer. This mirrored the arrangement at Cape Canaveral, where operations director Walt Williams held a position coordinating with the DOD on search-and-rescue, and the PAO - the public affairs officer, known as "Shorty" Powers during Mercury - provided commentary to the press and public.

• 5. Shuttle Era and Expansion

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  When the Space Shuttle program began, Mission Control changed its vocabulary. The MOCRs were redesignated flight control rooms, or FCRs (pronounced "ficker"). MOCR 1 became FCR 1, the first shuttle control room. FCR 2 served mostly for classified Department of Defense shuttle flights before being remodeled back to its Apollo-era configuration.

  From the moment a Space Shuttle cleared its launch tower in Florida until it touched down on Earth again, Mission Control in Houston was in charge. When a shuttle mission was in progress, its control room ran around the clock in three shifts.

  In 1992, JSC broke ground on an extension to Building 30. The new five-story section, known as 30 South, went operational in 1998. It housed two new flight control rooms called the White FCR and the Blue FCR. The White FCR worked alongside FCR 2 for seven shuttle missions - STS-70 through STS-76 - before taking over all remaining shuttle flights through the end of the program. Between shuttle missions, the White FCR was reconfigured periodically as a backup for ISS operations.

  The White FCR's console layout during shuttle operations placed the FDO (pronounced "fido") at the front, responsible for orbital guidance. The FLIGHT position - the Flight Director - sat in the fourth row alongside CAPCOM and INCO. The back row included PAO, the mission's public voice; BOOSTER, responsible for the solid rocket boosters and main engines during ascent; and SURGEON. During flights that involved the Russian Mir station, a controller called RIO occupied one of the back-row positions, serving as a Russian-speaker who communicated with the Russian MCC, known as Tsup.

  Building 30 was named for Christopher C. Kraft Jr. on the 14th of April 2011, honoring the man who had founded the flight control operation and served as its first Flight Director.

• 6. ISS and the Modern Room

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  The International Space Station demanded a different kind of Mission Control. The Blue FCR, housed in the 30 South extension, became the first ISS control room when it opened in 1998 under the name Special Vehicles Operations Room. It ran continuously until the fall of 2006, when ISS operations shifted to a thoroughly rebuilt FCR 1.

  FCR 1's reconstruction was substantial. The room shed the traditional tiered floor arrangement that had defined Mission Control since the MOCR era. All rows sat at the same level. New technologies replaced hardware that had been current in 1998 but was already aging by the mid-2000s. The rebuilt room went active in October 2006, driven partly by the growth of the ISS itself and partly by the international coordination required among partner control centers worldwide.

  To manage staffing during quieter periods on the station, Mission Control developed a scheme called Gemini. Under this concept, two "super-console" operators could cover the work of up to eight controllers. One position, call sign TITAN - standing for Telemetry, Information Transfer, and Attitude Navigation - covered communications, data handling, and motion control. The other, ATLAS - Atmosphere, Thermal, Lighting and Articulation Specialist - covered thermal control, environmental systems, and electrical power. The name Gemini nodded both to the concept of two controllers working as twins and to the Gemini program, which had been the first set of missions controlled from that room. The Titan name further honored the booster that launched the original Gemini spacecraft.

  After ISS assembly was declared complete in 2010, the Gemini scheme was retired. Six disciplines were consolidated into four positions: ETHOS, covering environmental and thermal systems; SPARTAN, covering electrical power and external thermal control; CRONUS, combining communications and data handling; and ADCO, covering motion control systems.

  From 2012 to 2014, the rooms that had served the Shuttle program were upgraded under a project called Mission Control Center for the 21st Century, or MCC-21. The consoles in FCR 1, the White FCR, the Blue FCR, the Simulation Control Area, and the multi-purpose support rooms were all replaced with modern hardware. Part of the motivation was to accommodate commercial companies operating alongside NASA in Mission Control. The White FCR's renovation was officially completed and unveiled in April 2014.

• 7. Backup Plans and Commercial Crew

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  Houston is Mission Control's permanent home, but it has always maintained contingency plans. When a hurricane threatens the Johnson Space Center, NASA can relocate operations to a Backup Control Center. For Hurricane Harvey in 2017, that backup was a hotel in Round Rock, Texas, roughly four hours from Houston. For Hurricane Laura in 2020, operations shifted to the Columbia Scientific Balloon Facility in Palestine, Texas - designated the primary backup site since 2017. For Hurricane Ike in 2008, NASA activated backup operations simultaneously in both Round Rock and Huntsville, Alabama.

  For longer-term disruptions, NASA can fall back to the Huntsville Operations Support Center at Marshall Space Flight Center, which handles ISS operations during extended outages at Houston.

  The arrival of commercial crew vehicles changed Mission Control's geography in a different way. In 2019, the Boeing CST-100 Starliner became the first commercial crew vehicle controlled from Houston. The SpaceX Dragon 2 flew its demo mission the same year, but SpaceX operates its own Mission Control at its headquarters in Hawthorne, California.

  Boeing Starliner missions involve a web of control centers across the country. The United Launch Alliance's Advanced Spaceflight Operations Center at Cape Canaveral Space Force Station oversees Atlas V launch operations, with support from the company's headquarters in Denver, Colorado. A Boeing Mission Control Center at Kennedy Space Center handles the Starliner during ascent, orbit, and entry. At Houston, the CST-100 mission is managed from the White FCR and an adjacent operations suite, while the Guidance, Navigation and Control team works from the Blue FCR down the hall. The multi-purpose support rooms, staffed by backup flight controllers who analyze data and run simulations, round out the team providing real-time advice to the primary controllers in FCR 1.