Ohio Malmstrom AFB, Montana 341st SMW (20 terminals - 20 LCCs) Mather AFB, California McConnell AFB, Kansas 22 BW (Command Post), 381st SMW (18 LCCs) CLOSED Minot AFB, North Dakota (5 BW/91 SMW 15 LCCs) Pease AFB, New Hampshire (509 BW Command Post) CLOSED Plattsburgh AFB, New York (380 BW Command Post) CLOSED Robins AFB, Georgia (19 BW Command Post) Seymour Johnson AFB, North Carolina (68 BW Command Post) Travis AFB, California Vandenberg AFB, California (1 STRAD Command Post)1 LCC O1A Whiteman AFB, Missouri - 351st SMW (16 terminals - 15 LCCs and Wing Command Post) CLOSED Wurtsmith AFB, Michigan (379 BW Command Post) March AFB, California (15th AF COC) History The first program (487L) took six years from the time of the initial requirement to full operation. The second part (616A), which was basically a modification of an already operational system, took 10 years. Chronology 1961 29 Sep – Headquarters USAF issues Specific Operating Requirement 193, for the Survivable Low Frequency Communications System; system is envisioned to link Alternate Joint Command Center with command centers of SAC, NORAD, SAC numbered air forces with LF radio networks; a total of 18 transmit/receive (T/R) sites and 375 LF-receive only (R/O) in all SAC launch facilities, mobile Minuteman trains, SAC air base control rooms, and SAC UHF positive control stations in the northern tier 1962 12 Mar – Amendment to SOR 193 changes number of transmit T/R sites to 19 (three each at AJCC, SAC, NORAD, two each at 2d Air Force, 15th Air Force and 8th Air Force, one each at Larson AFB, Southern Alaska, Sondrestrom AB, and the United Kingdom; Full Operating Capability was extended from July 1964 to May 1965. 27 Apr – A revised program directive delineated the network; T/R equipment would be installed at HQ SAC, the SAC numbered air force headquarters, and in the ABNCP, Alternate Joint Command Center (AJCC) and NORAD command center. 14 Green Pine stations, missile launch control centers, all SAC bomber wing command posts would have R/O terminals, as would the NORAD regional control centers. Initial Operating Capability (IOC) was placed at 1 Oct 1966. 1968 29 Jul 1968 – Silver Creek site accepted by SAC 19 Aug 1968 – Silver Creek site turned on for continuous operation 5 Sep 1968 – Silver Creek begins operational testing 1971 16 Jun – SLFCS IOC obtained by SAC units 1974 26 Jul – HQ