NASA also took Crews, although as a test pilot rather than an astronaut, and he would continue flying NASA aircraft until 1994. All seven eventually flew Space Shuttle missions. Those that did not transfer to NASA could not fight in combat for three years because of the risk of capture. Not being able to serve in Vietnam hurt their careers, and some soon left the military. The Titan III booster eventually became a mainstay of the military satellite program. The Titan IIIC version was capable of lifting into low Earth orbit; its successor, the Titan IIID developed for Hexagon, could lift , and the Titan IIIM developed for the MOL would have been able to lift . In this, it competed with NASA's Saturn IB, which could lift . This could be considered a case of wasteful duplication, but the cost of a Titan IIIM launch was half that of Saturn IB. The Titan IIIM never flew, but the UA1207 solid rocket boosters developed for the MOL were eventually used on the Titan IV, and the Space Shuttle Solid Rocket Booster were based on materials, processes and the UA1207 design developed for MOL, with only minor changes. NASA also used work on the Gemini B space suits for the agency's own suits, MOL's waste management system flew on Skylab, and NASA Earth Science used other MOL equipment. Work on Space Launch Complex 6 was 92 percent complete. The main task remaining was conducting acceptance demonstration tests. It was decided to complete the construction and tests, but not install AGE, and then place the facility in caretaker status, with a caretaker crew provided by the 6595th Aerospace Test Wing. In 1972, the USAF decided to refurbish SLC 6 for use with the Space Shuttle. This cost more than anticipated, some $2.5 billion (equivalent to $ in ), and the date of the first launch had to be postponed from June 1984 to July 1986. The airport runway at Easter Island developed for MOL was extended by an additional to to allow for an emergency Space Shuttle landing and a piggyback retrieval by a modified Boeing 747 Shuttle Carrier Aircraft, at a cost of $7.5 million (equivalent to $ in ). Preparations were underway for STS-62-A, the launch of the from SLC 6, commanded by MOL astronait Bob Crippen, with NRO director Edward C. Aldridge Jr. on board, when the Space Shuttle Challenger disaster occurred in January 1986. Plans for Space Shuttle launches from SLC 6 were abandoned, and none ever flew from there.