So, you’re in shape. You can carry your rifle, reloads, med kit, water, food, & shelter through driving snow/rain, up hill (both ways) for twenty miles without shortness of breath.
Ever wonder when you would ever have the chance to actually do this?
How adept are you with observing people, places, and events? How sharp is your ability to observe and report. How detailed and accurate can you be? How good are you at looking just like everyone else?
PT is always a good idea. Mad skills with implements of destruction as well.
However, when it comes to observe & report, where are you in the great ineffable plan? How unobtrusive can you be while still being effective?