Space Launch Complex-6 (SLC-6, nicknamed "Slick Six") at Vandenberg Air Force Base in California is a launch pad and support area. The site was originally developed for the Titan III and Manned Orbiting Laboratory, which was cancelled before construction of SLC-6 was complete. The complex was later rebuilt to serve as the west coast launch site for the Space Shuttle, but again went unused due to budget, safety and political considerations. The pad was subsequently used for several Athena launches before being modified to support the Delta IV launch vehicle family, which have used the pad since 2006.