"Rogue Programmer Sabotages Navy's Computers:"

Richard F. Sylvestre, a former government contractor who had a top- secret clearance, pleaded guilty on Wednesday to sabotaging computers used to track U.S. Navy submarines.

...According to this article in the Virginian-Pilot, Sylvestre planted a logic bomb in several navy computers after his company was passed over on a bid. He then fled to Italy.

Apparently, three of the five navy computers used to track submarines were shut down as a result of these actions. If all five had been shut down, the navy would have been blind.