I mostly agree that the environment in government contracting is pretty laid back. We definitely have surge times, but generally we're focused more on getting things done correctly over fast. I think there's also a good understanding that people aren't as effective when they work over 40 hours/week for consecutive weeks.
Having been in government, this seems to be the opposite of what I've seen. Makes me think it is fully a byproduct of culture, independent of the work done.