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Space Launch Complex 37 (SLC-37) is a rocket launch facility located at the Cape Canaveral Space Force Station on Merritt Island, Florida, United States.
The complex was originally constructed in support of the Saturn I and Saturn IB rocket programs, with construction beginning in 1959 and completion of Pad 37B in August 1963.
It features two launch pads, 37A and 37B, though only Pad 37B was ever fully utilized for launches.
The site was initially used for eight Saturn I and Saturn IB launches between January 1964 and January 1968, including the first launch of the Saturn I (SA-5) on January 29, 1964, and the final Saturn IB launch (Apollo 5) on January 22, 1968.
After the Apollo program, the pad was deactivated in 1972 and remained dormant until the early 21st century.
In the 2000s, SLC-37 was reactivated and renovated for use by United Launch Alliance (ULA) to support the Delta IV launch vehicle family.
The refurbishment included the construction of a 330-foot-tall mobile service tower and a six-story Horizontal Integration Facility (HIF), which was used to horizontally assemble the Delta IV rockets before erecting them at the pad.
The first Delta IV launch from SLC-37 occurred on November 20, 2002, and the complex hosted a total of 35 Delta IV launches, including the maiden flight of the Delta IV Heavy on December 21, 2004.
The final Delta IV launch, and the last flight of the Delta family, was the NROL-70 mission on April 9, 2024.
Following the retirement of the Delta IV program, the site has undergone significant changes to prepare for SpaceX’s Starship program. In June 2025, the former ULA infrastructure, including the mobile service tower and lightning towers, was demolished to make way for SpaceX’s Starship operations.
SpaceX has received approval to develop SLC-37 for Starship launches, and construction has begun.
The complex is being converted into SpaceX’s third Starship launch site, alongside Starbase in Texas and Launch Complex 39A at Kennedy Space Center.
The site is expected to support high-frequency, airport-like operations for Starship, contributing to national security and Artemis program goals.
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I saw the first Saturn rocket blast off from Canaveral. I think it was 1965. I had a great vantage point thanks to a relative. What I remember most is the noise. The roar. You knew you were dealing with almost unimaginable power.