Even though I've never had any real reason to worry, it's just annoying and stressful because at the end of the day, anybody can be on the chopping block. Luckily for the last 6 years, not a single person on my team has been let go. I think that maybe my salary + IC level is taken into consideration as well; considering I'm only an IC7 lol.
I wonder if there is "cussion" to being in FED? Then again, the org I'm in is significantly larger on the corporate side and they very rarely get hit, either.