Space Shuttle Columbia facility beginning in January 1984, undergoing modifications that removed the Orbiter Flight Test hardware and bringing it up to similar specifications as those of its sister orbiters. At that time the shuttle fleet was expanded to include "Discovery" and "Atlantis". "Columbia" returned to space on January 12, 1986, with the launch of STS-61-C. The mission's crew included Dr. Franklin Chang-Diaz, as well as the first sitting member of the House of Representatives to venture into space, Bill Nelson. The next shuttle mission, STS-51-L, was undertaken by "Challenger". It was launched on January 28, 1986, ten days after STS-61-C had landed,
Bill Nelson active duty from 1968 to 1970, attaining the rank of captain, and he remained in the Army until 1971. Nelson was admitted to the Florida bar in 1968, and began practicing law in Melbourne in 1970. In 1971, he worked as legislative assistant to Governor Reubin Askew. In 1972, Nelson married Grace Cavert. The couple have two adult children: Charles William "Bill Jr." Nelson and Nan Ellen Nelson. In 1986, Nelson became the second sitting member of Congress (and the first member of the House) to travel into space. He went through NASA training with Senator Jake Garn of Utah.