http://www.gwu.edu/~nsarchiv/NSAEBB/NSAEBB23/index2.html#7adoc

Document 12. "Activation of Echelon Units," from History of the Air Intelligence Agency, 1 January - 31 December 1994, Volume I (San Antonio, TX: AIA, 1995).

The first extract from the Air Intelligence Agency's 1994 annual history provides additional information on the ECHELON network. ECHELON units include components of the AIA's 544th Intelligence Group. Detachment 2 and 3 are located at Sabana Seca, Puerto Rico and Sugar Grove, West Virginia respectively. The second reference to Detachment 3 is apparently a typo that should read Detachment 4 (located at Yakima, Washington). The deleted words appear to be "civilian communications," "NAVSECGRU" and "NSA."

The second extract notes that AIA’s participation in a classified activity "had been limited to LADYLOVE operations at Misawa AB [Air Base], Japan." The Misawa LADYLOVE activity was initiated during the Cold War to intercept Soviet military communications transmitted via satellite—along with similar operations at Menwith Hill, UK; Bad Aibling, Germany; and Rosman, North Carolina. This extract suggests that both Guam and Misawa have, at the least, been considered as possible sites for ECHELON operations.