S73-25283 (8 May 1973) --- Astronaut Paul J. Weitz, prime crew pilot of the first manned SkyLab mission, is suited up in Bldg. 5 at Johnson Space Center during prelaunch training activity. He is assisted by astronaut Charles Conrad Jr., prime crew commander. The man in the left background is wearing a face mask to insure that Conrad, Joseph Kerwin and Weitz are not exposed to disease prior to launch. Photo credit: NASA