... STS-4, the final flight of the Orbital Flight Test (OFT) program, did in fact complete 92 percent of its test objectives. The OFT program consisted of four two-man crews for the first four missions of the shuttle program. ... And for more memories and experiences from more than 700 remarkable people involved in the space program over the last 50 years, read their oral histories available on the JSC History Portal: http://www.jsc.nasa.gov/history/oral_histories/oral_histories.htm . ...