Astronaut Group 7, referred to in some documents as the USAF MOL Transfer, was announced by NASA on August 14, 1969, and was the last group to be selected during the Apollo era. After the USAF Manned Orbiting Laboratory (MOL) project was cancelled, NASA hired seven of the astronauts selected for that program to form this "Group 7", roughly the younger half of the MOL astronauts. By the time they joined NASA, all Apollo flight assignments had been lined up, but four were given non-flying support assignments for Apollo. Others were also given support assignments for Skylab and the Apollo-Soyuz Test Project, with Bobko and Crippen participating in the Skylab Medical Experiment Altitude Test. Group 7 went on to form the core of early Space Shuttle pilots, upgrading to commander after their first flight, flying 17 STS missions between them, plus the Approach and Landing Tests of Enterprise (OV-101).