Conrad first flew on Gemini 5 with Gordon Cooper, proving that crews could remain in space long enough for a lunar mission. He later commanded Gemini 11, reaching a record high Earth orbit and conducting rendezvous — open definition, docking, and EVA — open definition operations with Richard Gordon. Those flights helped build the operational confidence Apollo would need.

As commander — open definition of Apollo 12, Conrad became the third person to walk on the Moon. He and Alan Bean landed near Surveyor 3 in the Ocean of Storms, demonstrating precision landing and returning parts of the robotic spacecraft for study. Conrad later commanded Skylab 2, the first crewed mission to the damaged space station — open definition, where his crew helped save the workshop by performing critical repairs. His career joined technical skill with a famously irreverent personality.

Conrad's background fit the broader pattern of the early astronaut corps: technical training, operational discipline, and a career built around difficult work before spaceflight. His formal education included Princeton University (B.S. Aeronautical Engineering, 1953). His service background is recorded as Captain, United States Navy. His personal record also sits alongside a family life recorded as two marriages, four children, a reminder that these careers unfolded within ordinary lives as well as national history.