[3] CONUS "Army Radar Station" deployments for World War II were primarily for coastal anti-aircraft defense, e.g., L-1 at Oceanside CA, J-23 at Seaside OR (Tillamook Head), and B-30 at Lompoc CA;[4][unreliable source] and "the AAF...inactivated the aircraft warning network in April 1944.
Air Defense Command (ADC) rejected Supremacy since "no provision was made in it for the Alaska to Greenland net with flanks guarded by aircraft and picket ships [required] for 3 to 6 hours of warning time",[5]: 129 and "Congress failed to act on legislation[specify] required to support the proposed system.
[5]: 221 "Lashup I" was a stopgap[9] $561,000 program approved in October 1948 by the ADC commander to expand "the five-station radar net then in existence".
[2]: 54 The USAF reallocated $50 million to instead implement the program as a "permanent Modified Plan" (modified from Supremacy) to "start construction on the high Priority Permanent System of radars in February 1950 with the first 24 radar sites to be constructed by the end of 1950"[2]: 61 —operating in 1951 were P-1 in WA (opened June 1, 1950) and TM-187 in TX.
Early June 1950 exercises "in the 58th Air Division [tbd Lashup sites] indicated insufficient low-altitude coverage," and Maj Gen Morris R. Nelson identified on June 12 that ADC could employ "an American version of CDS", the British command and control system.
[12] Congress subsequently passed a "supplemental appropriation" in September 1950 of nearly $40 million for new radar stations and search/height-finder equipment.
[2]: 61 Phaseout of Lashup radar stations began in January 1952[citation needed] at Larson AFB (L-29) & Richland (L-30) in Washington that were replaced by Othello AFS (P-40).