Jon McBride speaks at a ceremony honoring former NASA astronaut Steven R. Nagel at the Space Shuttle Atlantis exhibit at the Kennedy Space Center Visitor Complex.

Former NASA astronaut Jon McBride speaks at a wreath-laying ceremony honoring former NASA astronaut Steven R. Nagel at the Space Shuttle Atlantis exhibit at the Kennedy Space Center Visitor Complex in Florida.

Nagel died Aug. 21 after a long illness. He was 67 years old. Nagel served as a mission specialist on his first space shuttle flight, STS-51G, in 1985. He was pilot on his second shuttle flight, STS-61A, also in 1985. He commanded his final two flights, STS-37 and STS-55, in 1991 and 1993, respectively. He logged a total of 723 hours in space. To learn more about Nagel's career, visit http://www.nasa.gov/press/2014/august/former-nasa-astronaut-steven-nagel-veteran-of-four-shuttle-flights-dies-at-67/. Photo credit: NASA/Dimitri Gerondidakis