PAYLOAD SPECIALISTS (PS)'s - JARVIS/BUTTERWORTH - SHUTTLE MOCKUP AND INTEGRATION LABORATORY - JSC

S85-28161 (1 March 1985) --- Astronauts Gregory Jarvis, left, and L. William Butterworth take a breather from training activities in Johnson Space Center’s (JSC) shuttle mock-up and integration laboratory. Jarvis and Butterworth, both Hughes Co. payload specialists, were originally assigned as payload specialists to STS-51D but were reassigned to STS-51L. Photo credit: NASA