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Vandenberg AFB Space Launch Complex 4 : ウィキペディア英語版 | Vandenberg AFB Space Launch Complex 4
Space Launch Complex 4 (SLC-4) is a launch site at Vandenberg Air Force Base with two pads, both of which are used by SpaceX for Falcon 9 launch operations. The complex was previously used by Atlas and Titan rockets between 1963 and 2005. It consisted of two launch pads, SLC-4W and SLC-4E, which were formerly designated PALC2-3 and PALC2-4 respectively. Both pads were built for use by Atlas-Agena rockets, but were later rebuilt to handle Titan rockets. The designation SLC-4 was applied at the time of the conversion to launch Titans. Both pads at Space Launch Complex 4 are currently leased by SpaceX. SLC-4E is leased as a launch site for the Falcon 9 rocket, which first flew from Vandenberg on 29 September 2013, following a 24-month refurbishment program which had started in early 2011. SpaceX began a five-year lease of Launch Complex 4W in February 2015 in order to use that area to bring back VTVL Return-To-Launch-Site (RTLS) first-stage boosters of the reusable Falcon 9 and Falcon Heavy launch vehicles at a ''landing'' pad ==SLC-4E==
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