Space Launch Complex 2

Delta II at SLC-2W, with Gravity Probe B
Launch site	Vandenberg SFB
Location	34.7545°N 120.6198°W
Short name	SLC-2
Operator	US Space Force
Total launches	151
Launch pad(s)	2
Orbital inclination range	51° – 145°
SLC-2W launch history Status Active Launches 99 First launch 17 September 1959 PGM-17 Thor Last launch 22 December 2023 Firefly Alpha / "Fly the Lightning" Associated rockets PGM-17 Thor Thor-Agena Delta Delta II Firefly Alpha SLC-2E launch history Status Inactive Launches 52 First launch 16 December 1958 PGM-17 Thor Last launch 12 March 1972 Delta N / TD-1A Associated rockets PGM-17 Thor Delta Thor-Agena Thorad-Agena

Space Launch Complex 2 (SLC-2) is an active rocket launch site at Vandenberg Space Force Base, in California, USA. It consists of two launch pads. The East pad (SLC-2E, originally LC 75-1-1) was used for Delta, Thor-Agena and Thorad launches between 1966 and 1972 and has been demolished.^[1] The West pad (SLC-2W, originally LC 75-1-2) was used for Delta, Thor-Agena and Delta II launches from 1966 until 2018, when the Delta II performed its last flight.^[2][3]

SLC-2W has been repurposed to launch Firefly Alpha for Firefly Aerospace. During the demolition process, a fire broke out on October 15, 2020, inside the Delta II mobile service tower.^[4] The maiden flight of Firefly Alpha took place on September 3, 2021 and resulted in a flight failure.^[5] The second flight on 1 October 2022 was successful in reaching orbit.

Space Launch Complex 2 was originally part of Launch Complex 75 (LC 75) and was known by designation LC 75-1 or just 75-1 (and the launch pads were designated LC 75-1-1 and LC 75-1-2). The first launch out of the newly designated Space Launch Complex 2 was that of a Delta E with ESSA-3 on 2 October 1966 from SLC-2E.^[6]

SLC-2E and SLC-2W are located approximately 2,000 feet (610 m) apart.^[7]