Keep going on hikes, keep having your friends in your life, keep that downtime sacred as well because as hard as you work in any job, it's really nice to have the relaxing de-stressors. Stress is the worst thing. That's the ultimate demise of any good thing.
Resist your fear; fear will never lead to you a positive end. Go for your faith and what you believe.
In terms of the idea of long-term occupation - I have been reading a little bit more about this period - and you can see in that occupation are many lessons for the current occupation of Iraq. So we have these connections that go way back that people aren't aware of.

