Space Launch Complex 17, previously designated Launch Complex 17, was a launch site at Cape Canaveral Space Force Station, Florida used for Thor and Delta rocket launches between 1958 and 2011.
It was built in 1956 for use with the PGM-17 Thor missile, the first operational ballistic missile in the arsenal of the United States. More recently the launch complex has been used for vehicles in the Delta rocket family, derived from the Thor missile, to launch probes to the Moon and planets, solar observatories and weather satellites.
SLC-17 features two expendable launch vehicle launch pads, 17A and 17B. The pads were operated by the 45th Space Wing and have supported more than 300 Department of Defense, NASA and commercial missile and rocket launches. Following the last military launch, in August 2009, SLC-17A was withdrawn from use, and LC-17B was transferred to NASA for two remaining launches.
Pad 17A supported its first Thor missile launch on 3 August 1957, and Pad 17B supported its first Thor launch on 25 January 1957. The site was upgraded in the early 1960s to support a variety of more modern ELVs, which were derived from the basic Thor booster.