Some have, others have been neglected...as if we could rest indefinitely on our technology from 20 years ago...as if that was the be-all and end-all, and we would always have the best.
Hence Cheney as SecDef ordered the termination of B-2 production, and scrapping the F-14 tooling back in '92.
That tenet may no longer be valid:
61 posted on 01/02/2008 3:40:10 PM PST by Paul Ross
(Ronald Reagan-1987:"We are always willing to be trade partners but never trade patsies.")