Vandenberg Space Launch Complex 4

Space Launch Complex 4
	SLC-4 with Falcon 9 on launch pad at SLC-4E in January 2017
Launch site	Vandenberg Space Force Base
Location	34°37′59″N 120°36′47″W / 34.633°N 120.613°W
Short name	SLC-4
Operator	U.S. Space Force; SpaceX (SLC-4E from 2011)
Total launches	236
Launch pad(s)	2 (1 became a landing zone for Falcon 9)
Orbital inclination ; range	43° – 145°
Status
SLC-4W (PALC-2-3) launch history
Status	Repurposed
Launches	94
First launch	12 July 1963; Atlas-Agena D / OPS-1467
Last launch	18 October 2003; Titan 23G
Associated; rockets	Atlas-Agena LV-3; Atlas SLV-3; Titan IIIB; Titan 23G;
LZ-4 (PALC-2-3) landing history
Status	Active
Landings	18 (18 successful, 0 failure)
First landing	7 October 2018 SAOCOM 1A
Last landing	2 May 2024 WorldView Legion 1 & 2
Associated; rockets	Falcon 9 Block 5
SLC-4E (PALC-2-4) launch history
Status	Active
Launches	142
First launch	14 August 1964; Atlas-Agena D / OPS 3802
Last launch	10 May 2024; Falcon 9 Block 5 / Starlink G8-2
Associated; rockets	Atlas-Agena LV-3; Atlas SLV-3; Titan IIID; Titan 34D; Titan IV; Falcon 9 Block 5 (current);

Space Launch Complex 4 (SLC-4) is a launch and landing site at Vandenberg Space Force Base, California, U.S. It has two pads, both of which are used by SpaceX for Falcon 9, one for launch operations, and the other as Landing Zone 4 (LZ-4) for SpaceX landings.

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 PALC-2-3 and PALC-2-4 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 Titan launch vehicles.^[1]

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.^[2]^[3] SpaceX began a five-year lease of Launch Complex 4 West in February 2015 in order to use that area as a landing pad to bring back VTVL return-to-launch-site (RTLS) first-stage boosters of the reusable Falcon 9 launch vehicle. That pad was later named by SpaceX as Landing Zone 4 and first used operationally for a Falcon 9 booster landing in 2018.

^ "NROL-85 Launch". National Reconnaissance Office. Retrieved 2 April 2023.
^ Scully, Janene (5 February 2011). "Report: Falcon plan OK for environment". Santa Maria Times. Retrieved 7 February 2011.
^ "SpaceX". SpaceX. 15 August 2011. Archived from the original on 17 August 2011. Retrieved 15 August 2011.

[1] "NROL-85 Launch". National Reconnaissance Office. Retrieved 2 April 2023.

[ScullyJ-2] Scully, Janene (5 February 2011). "Report: Falcon plan OK for environment". Santa Maria Times. Retrieved 7 February 2011.

[SpaceX-Updates-3] "SpaceX". SpaceX. 15 August 2011. Archived from the original on 17 August 2011. Retrieved 15 August 2011.

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