CREW 21/22 . ... ISS-21 IMAGE . ... ISS-22/23 Flight Engineer, . ... In August 1996 Wheelock was assigned to the Johnson Space Center as a test engineer to provide the Shuttle equipment test. ... He was assigned as a lead test engineer participating in the ISS hardware testing. ... In 2001 he was assigned as the support astronaut for the ISS-2 and ISS-4 crews. ... The main objective of the flight was to deliver the new Harmony module to the International Space Station and deploy P6 Solar Arrays. ...