Space Launch Complex 3

Space Launch Complex 3. Space Launch Complex 3 (SLC-3) is a dual-pad launch site located at Vandenberg Space Force Base on the central coast of California. Operated by the United States Space Force, it has been a cornerstone for launching military and scientific payloads into polar orbits since the late 1950s. The complex has evolved through several major launch vehicle families, supporting critical missions for the United States Department of Defense, NASA, and the National Reconnaissance Office.

History

The complex was constructed between 1958 and 1959 as part of the United States Air Force's burgeoning space and missile testing programs at what was then Vandenberg Air Force Base. It was originally designed for the SM-65 Atlas intercontinental ballistic missile, with its first launch occurring in 1959. Throughout the Cold War, SLC-3 was a key asset for the Western Test Range, supporting the transition from missile tests to dedicated space launches. Major upgrades were made in the 1960s to accommodate the Atlas-Agena rocket, which carried numerous classified satellites for the National Reconnaissance Office and early planetary probes for NASA, such as the Ranger program. The complex was later modified for the Atlas II and Atlas III vehicles before its current configuration for the Atlas V.

Facilities and infrastructure

The complex consists of two distinct launch pads: SLC-3E (East) and the inactive SLC-3W (West). SLC-3E features a mobile launch platform system and a fixed Vertical Integration Facility (VIF) for the Atlas V, allowing payloads and upper stages to be integrated vertically before rollout to the pad. This infrastructure is supported by extensive propellant storage facilities for RP-1, liquid oxygen, and liquid hydrogen. The adjacent SLC-3W pad, historically used for Atlas-Agena launches, remains in a state of long-term dormancy. Support facilities include blockhouses for launch control, payload processing cleanrooms, and secure integration buildings managed by United Launch Alliance.

Launch history

Since its inaugural launch in 1959, SLC-3 has hosted over 150 launches. The early era was dominated by tests of the SM-65 Atlas and launches of the Atlas-Agena, which deployed vital reconnaissance satellites like the CORONA series. The pad later supported the Atlas II and Atlas III rockets throughout the 1990s and early 2000s. With the introduction of the Atlas V in 2005, SLC-3E became the exclusive West Coast launch site for that vehicle, conducting missions primarily for the United States Space Force and the National Reconnaissance Office. Notable launch campaigns include the final Atlas II mission in 2004 and the first West Coast Atlas V launch in 2005.

Notable missions

SLC-3 has been the departure point for many historically significant spacecraft. It launched the Ranger 3 and Ranger 5 lunar probes for NASA in the early 1960s. The complex was pivotal for the CORONA spy satellite program, a critical intelligence asset during the Cold War. In the 1990s, it supported the launch of NASA's SeaWiFS ocean-monitoring satellite on an Atlas II. More recently, SLC-3E has been used for vital national security payloads aboard the Atlas V, including the first launches of the Space Based Infrared System (SBIRS) and numerous missions for the National Reconnaissance Office, such as the NROL-35 and NROL-42 satellites.

Current status and future use

As of the early 2020s, SLC-3E remains an active launch site operated by United Launch Alliance for Atlas V missions, though its future launch manifest is limited as the program nears retirement. The final Atlas V launches from Vandenberg are scheduled to carry payloads for the United States Space Force. The long-term fate of the complex is uncertain, with potential discussions about demolition or repurposing for new launch systems following the conclusion of the Atlas V program. Its heritage and infrastructure position it as a potential asset for future commercial or government launch providers seeking access to polar orbits from the Western Test Range. Category:Space launch complexes in the United States Category:Vandenberg Space Force Base Category:1959 establishments in California