Members of the SOFIA infrared observatory support team gather around Apollo 11 astronaut Buzz Aldrin (in red shirt) during Aldrin's tour of NASA Dryden.

Apollo 11 astronaut Buzz Aldrin autographs NASA Dryden's F-16XL research aircraft, as his crewmate Neil Armstrong had previously done on the other side.

Apollo 11 astronaut Buzz Aldrin and tour guide Mary Ann Harness check out models of the Ares 1 and Ares 5 space vehicles during Aldrin's tour of NASA Dryden.

Apollo 11 astronaut Buzz Aldrin tries out the control station for the X-48B Blended Wing Body unmanned subscale demonstrator during a tour of NASA Dryden.

Apollo 11 astronaut Buzz Aldrin (left) and Apollo-Soyuz and space shuttle astronaut Vance Brand discuss Dryden's work on an Orion fit-check crew module mockup.