Yep... They were 370s. I worked on them at Onizuka AS out in Sunnyvale, California from 1991 to 1996. We thought they were old then, but they did the jobs flawlessly. IBM worked closely with the Air Force to get them to do real time processing instead of the normal batch processing that most mainframes do. It was a lot of fun... but I hated doing our weekly backups to approximately 50 nine-track tapes. Of course, the center i worked in didn't handle the GPS satellites, but we did handle a lot of other missions (including providing backup support for the Space Shuttle).