Source: ADTAC Ground Systems Digest, 1st Edition, 2 Sep 1981, page 4. [Paraphrased to change present and future verb tenses all to past tense.]
The 416M (BUIC) system was initiated with the installation of the first AN/GSA-51 (BUIC II) computer in 1964. The AN/GSA-51 was modified, starting in 1968, into the AN/GYK-19 (BUIC III). The number of BUIC computer systems peaked out at 22, each computer being located at a radar site. [Editor's Note: The first operational BUIC-II computer was at North Truro AFS, MA (Z-10), and the first operational BUIC-III computer was at Fort Fisher AFS, NC (Z-115).]
The last remaining BUIC III computer systems were at the Tyndall NORAD Control Center (TNCC) at Tyndall AFB FL and the 21st Radar Squadron, St. Margaret's, New Brunswick, Canada.
The operational system at the TNCC ceased operations when the SE ROCC became operational [in 1983].
The Canadian BUIC III ceased operations when the Canadian East ROCC became operational.
Contributed by Western Air Defense Sector (WADS) Historical Office