According to this story (link is slowwww) in Computerworld, the govt. may require background checks on non-government employees in critical positions. Folks like, say, system administrators. Programmers? (Heck, if you wrote a an HTTP parser or a memory allocator for that server product, you’d better be trustworthy).
Folks who have read Joseph Heller’s Catch-22 may recall the sing-for-your-supper result of runaway loyalty oaths.
Remember: The more oaths you sign, the more loyal you are. So get busy!