The first launch from LC-18 was a Viking rocket from LC-18A on 8 December 1956, on a test flight for Project Vanguard.

A further Viking launch was conducted in May 1957, and the Vanguard made its maiden flight from the complex in September.

Following this, the United States first satellite launch attempt was made from LC-18A, using Vanguard TV3, on 6 December 1957.

This failed to reach orbit and was destroyed by range safety 43 seconds after launch.

The launches from LC-18A used the Blue Scout Junior configuration, and were conducted between 21 September 1960 and 9 June 1965.