I finished the Heavy Gunner missions last night with a whopping D rank on the final one. Guess I'm just not cut out for Howitzers.

Alternatively, it may be possible that the Chromehounds developers have no idea what an "oil well" looks like, and so when they instruct you to blow one up you won't have a sweet clue what they're talking about. Do they mean the crude storage tanks? The flare system? The tall things that appear to be distillation columns? Perhaps chemical engineers shouldn't play games involving petrochemical installations.
On the other hand, flattening entire towns with judicious application of high-yield ordnance is surprisingly satisfying.
Has anyone chosen a nation yet? I saw Morskoj mentioned on the last page, but that was a while ago. I'd like to hop online so I can try a couple of AI skirmishes and earn scratch to buy some parts, but I don't want to be stranded alone in hostile territory.
