and Cape Dyer" ("BMEWS Rearward Long-Lines System" stations were at CFS Resolution Island & CFS Saglek.) President Dwight D. Eisenhower was notified on April 23, 1960 of "construction work at Thule on schedule [and that] all technical buildings have been accepted and emplacement of the electronic components is underway [and] erection of the four radar antennas was completed", and radar testing began on May 16, 1960—a simplex vacuum tube IBM 709 used as the prototype Missile Impact Predictor (MIP) occupied 2 floors (duplex IBM-709-TX solid-state computers of the AN/FSQ-28 Missile Impact Predictor Set were later installed in Building 2.) To predict when parts "might break down", the contractor also installed a "Checkout Data Processor"--RCA 501 computers with 32k "high speed memory", 5-76KC 556 bpi 3/4" tape drives, & 200 track random access LFE drums. The initial radar transmission from one of the scanner buildings was in August 1960. RCA operations On the same date as the BMEWS Central Computer and Display Facility in the continental United States, "at midnight on 30 September 1960 ["BMEWS Site I"] achieved initial operational capability", and a "shakedown" period followed which used the simplex MIP and voice transmission of data to the Colorado Springs' CC&DF. False alarmsOn October 5, 1960, when Nikita Khrushchev, the Soviet Premier, was in New York, radar returns during Thule moonrise produced a false alarm (on January 20, 1961, CINCNORAD approved 2-second FPS-50 frequency hoping to eliminate reception of echoes beyond artificial satellite orbits.) On November 24, 1961, an AT&T operator error at their Black Forest Microwave Station northeast of Colorado Springs caused a BMEWS communications outage to the Ent AFB CC&DF and its output to Strategic Air Command (a nearby B-52's overflight confirmed Site J had not been attacked.) The BRCS undersea cable from Greenland had been cut "presumably by fishing trawlers" in September, October, and November 1961 (the BMEWS teletype and backup SSB substituted)--Hard Head missions for continual monitoring commenced in 1961 (the Bomb Alarm System had been installed at the Thule and Clear BMEWS sites by 10 February 1961. After local interference (e.g., "cranes and floor waxers") and equipment problems were mitigated and a 72-hour test verified "the automatic rearward data transmission" (BRCS), the 1961 "authorization to begin fully automatic operation; effective 2400 hours GMT 31 January, was issued" "Lt. Col. Harry J. Wills [was the] senior air force officer on the project at Thule" on January 3,