[13] The "Clear Msl Early Warning Stn, Nenana, AK" was assigned to Hanscom Field, Massachusetts, on April 1, 1961,[14] and BMEWS Site II was completed July 1, 1961[7] (the date of IOC--Full operational capability was declared three months later.

[16] On July 31, 1962, NORAD recommended a tracking radar at Clear to close the BMEWS gap with Thule for low-angle missiles vice those with the 15-65 degree angle for which BMEWS was designed[15] (North Dakota's Cavalier AFS radar built in 1975 currently monitors for Hudson Bay launches.)

[citation needed] In 1964, the Good Friday earthquake struck, and Clear was unable to perform its mission for six minutes.

)[9] Clear provided emergency shelter for 216 flood refugees during August 1967, the same year many "temporary" buildings were replaced.

Personnel at the installation subsequently provided measurements for a University of Alaska experiment which injected sulfur hexafluoride into the upper atmosphere to see if the Aurora Borealis could be affected.

[citation needed] Clear had Bomb Alarm System equipment installed by the time the BAS was accepted on 10 February 1961.

[6] In 1975, the Secretary of Defense told Congress that Clear Air Force Station would be closed when the Shemya Island and Beale AFB radars became operational.

[26] On April 16, 1998, groundbreaking for installing 1987 AN/FPS-115 PAVE PAWS components from Texas (e.g., the array elements) was held at Clear[27] for the more advanced Raytheon AN/FPS-120[27] with 2500 "solid state transmitter" modules.

[28] On December 15, 2000, the FPS-50 and −92 transmissions ceased[citation needed] (all of the Arecibo Observatory's Litton L-5773 klystrons were obtained as surplus from Clear's decommissioned BMEWS transmitters.