Karol Joseph "Bo" Bobko (December 23, 1937 – August 17, 2023) was an American aerospace engineer, U.S. Air Force officer, test pilot, and a USAF and NASA astronaut. Bobko was the first graduate of the U.S. Air Force Academy to travel in space and the first person to fly on three different space shuttles across three different missions: STS-6, STS-51-D, STS-51-J.