,
Houston. After completing the research tests at Holloman Air Force Base, Kranz left McDonnell Aircraft and joined the NASA Space Task Group, then at its
Langley Research Center in
Virginia. Upon joining NASA, he was assigned, by flight director
Christopher C. Kraft, as a
Mission Control procedures officer for the uncrewed
Mercury-Redstone 1 (MR-1) test (dubbed in Kranz's autobiography as the "Four-Inch Flight", due to its failure to launch). As Procedures Officer, Kranz was put in charge of integrating Mercury Control with the Launch Control Team at
Cape Canaveral, Florida, writing the "
Go/NoGo" procedures that allowed missions to continue as planned or be aborted, along with serving as a sort of switchboard operator between the control center at Cape Canaveral and the agency's fourteen tracking stations and two tracking ships via
Teletype, located across the globe. Kranz performed this role for all crewed and uncrewed Mercury flights, including the
MR-3 and
MA-6 flights, which put the first Americans into space and orbit respectively. After MA-6, he was promoted to Assistant Flight Director for the
MA-7 flight of
Scott Carpenter in May 1962. MA-7 was his first mission as assistant flight director (AFD); he was under Kraft (the flight director of MA-7). Kranz and Kraft were not the sole reason that MA-7 was saved, as that would be attributed to the whole efforts of Mission Control, but they played a major role. Kranz continued in this role for the remaining two Mercury flights and the first three Gemini flights. With the upcoming Gemini flights, he was promoted to the Flight Director level and served his first shift, the so-called "operations shift", for the
Gemini 4 mission in 1965, the first U.S.
EVA and four-day flight. After Gemini, he served as a Flight Director on odd-numbered Apollo missions, including Apollos 1, 5, 7 and 9, and the first (and only) successful uncrewed test of the Lunar Module (Apollo 5). He was serving as Flight Director for
Apollo 11 when the
Lunar Module Eagle landed on the Moon on July 20, 1969. Kranz was chosen to be one of the first flight directors to fly crewed Apollo missions. Kranz worked with the contractor, McDonnell-Douglas on the Mercury and Gemini project, but for Apollo there was a new contractor,
Rockwell. Kranz describes Rockwell as new and unfamiliar with the space industry, as they were known for their aeronautical significance at the time. Kranz was assigned as a division chief for Apollo; his tasks included mission preparation, mission design, the writing of the procedures, and the development of the handbooks. Kranz explains that the Apollo program was different from other programs in that time was a major factor. Other missions were allotted ample amount of time; Apollo was not given this luxury. Kranz explains that the Mission Control logo is an interesting one; he associates it with commitment, teamwork, discipline, morale, tough, competent, risk, and sacrifice. Kranz's team was on duty when part of the Apollo 13
Service Module exploded and they dealt with the initial hours of the unfolding accident. His
"White Team", dubbed the "Tiger Team" by the press, set the constraints for the consumption of spacecraft consumables (oxygen, electricity, and water) and controlled the three course-correction burns during the trans-Earth trajectory, as well as the power-up procedures that allowed the astronauts to land safely back on Earth in the command module. He and his team were recommended by NASA Administrator
Thomas O. Paine in communications with
Richard Nixon to receive the
Presidential Medal of Freedom for their roles. He retired from NASA in 1994, after the successful
STS-61 flight that repaired the optically flawed
Hubble Space Telescope in 1993.
After retirement In 2000, Kranz published his autobiography titled
Failure Is Not An Option (), borrowing a line used in the 1995
Apollo 13 film by actor Ed Harris portraying Kranz. The
History Channel later used it to adapt a documentary about Mission Control in 2004. The five million dollar project was intended to be completed for the 50th anniversary of the Apollo 11 mission. For his efforts, Kranz was recognized by Houston Mayor Sylvester Turner and October 23, 2018 was declared "Gene Kranz Day". During the 2018 "To the Moon and Beyond" luncheon hosted by
Space Center Houston, The Gene Kranz Scholarship was started, geared towards funding young students to take part in activities and training for careers in STEM. The Ohio State Legislature introduced House Bill 358 to designate August 17 as "Gene Kranz Day" in the fall of 2019. In May 2020, the bill was passed by the Ohio House of Representatives and introduced in the Senate, where as of 2025 it remains at the committee stage. Post-retirement, Kranz became a flight engineer on a restored Boeing B-17 Flying Fortress, flying at air shows throughout the United States for six years. Kranz continues to give motivational speeches and talks about his experiences with the space programs. ==Personal life==