... U.S. Naval Captain . NASA Astronaut, USA . ... He performed three space flights of the total duration of 42 days 14 hr 22min 27 s; during these flights he performed five EVAs of the total duration of 33 hr 58 min. ... The flight duration was 12 days 21 hr 42 min 41s. The main flight task was the Z1 Truss and Pressurized Mating Adapter 3 delivery to the International Space Station. ... After his second space flight he led the newly formed ISS Crew Operations branch of the Astronaut Office. ...