STS065-18-022 (8-23 July 1994) --- During off-duty time on the Space Shuttle Columbia's mid-deck, four members of the crew, from the 1990 (thirteenth) astronaut class, display their group's insignia. The "hairballs" pictured, (left to right) are astronauts Donald A. Thomas, James D. Halsell, Jr., Carl E. Walz and Leroy Chiao.