I worked for General Dynamics on the A-12 Avenger II program[1] that was cancelled by Dick Cheney. Even when the Navy threatened to cancel the project, a lot of people thought they would never do it because so much money had been spent on it. However, the end of the Cold War, some technical problems, and the need to rebuild political capital after the Gulf War all contributed to it being cancelled.

[1] https://en.wikipedia.org/wiki/McDonnell_Douglas_A-12_Avenger...