I'm on the first island still, in fact I've only done the first mission, I've not even been to that Doctor dude yet, I'm sure taking my time clearing out the outposts and radio towers around the first island. Been quite fun so far, but just had a moment that made me laugh.
I was travelling to an outpost to take it down, as I got near I jumped out of my car, which promptly sailed over the cliff near the outpost, landed in the middle of the outpost, caught fire and then exploded, killing three of the bad guys nearby, the explosion of the car then also released a bear that had been caged, which then proceeded to wipe the rest of the bad guys out.
Base cleared, not detected, no alarms triggered and not a single shot fired!
Of course, there's the slight problem of the angry bear wandering around the base, but that's not my problem that's the Pakrats problem, or whatever they call themselves.