Apollo–Soyuz Test Project
Bobko was a member of the astronaut support crew for the Apollo–Soyuz Test Project (ASTP). This historic first international manned space flight was completed in July 1975. Subsequently, he was a member of the support crew for the Space Shuttle Approach and Landing Tests conducted at Edwards Air Force Base. He served alternately as CAPCOM and prime chase pilot during these Approach and Landing Test (ALT) flights.