On 20 October 1953 ADC requested a third phase of twenty-five radar sites be constructed.

The 811th Aircraft Control and Warning Squadron was moved to the former Port Isabel Auxiliary Naval Air Station on 1 January 1958.

As a GCI station, the squadron's role was to guide interceptor aircraft toward unidentified intruders picked up on the unit's radar scopes.

The Air Force inactivated Port Isabel AFS on 1 June 1961 due to budgetary constraints.

This article incorporates public domain material from the Air Force Historical Research Agency