Permanent System radar stations

The Permanent System ("P system") was a 1950s radar network ("P radar net") used for the CONUS "manual air defense system" and which had a USAF aircraft control and warning (AC&W) organization of personnel and military installations with radars to allow Air Defense Command ground-controlled interception of Cold War bombers attacking the United States.

Not to be confused with the preceding Lashup Radar Network or the subsequent Semi-Automatic Ground Environment (SAGE) Radar Network.
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