Well crap, maybe the Ace Combat series if you count them. Easily got at least 5k aircraft kills in them put together, not including ground targets and civilians that might get in the way of the falling debris/me just shooting at the ground pretending there are tiny little civilians there.
If that doesn't count, either World in Conflict, Sudden Strike, or Company of heroes. All of which I've got at least 200 hours in and have completed countless skirmishes and missions. I wouldn't be surprised if I've got around a million kills in CoH. A lot of my skirmishes are against the AI where I just wall around their base and leave the computer running. Usually my first line of defense falls from their overly Chinese military strategy, only to have the enemy be crushed by my 2nd and 3rd lines.
If that doesn't count, either World in Conflict, Sudden Strike, or Company of heroes. All of which I've got at least 200 hours in and have completed countless skirmishes and missions. I wouldn't be surprised if I've got around a million kills in CoH. A lot of my skirmishes are against the AI where I just wall around their base and leave the computer running. Usually my first line of defense falls from their overly Chinese military strategy, only to have the enemy be crushed by my 2nd and 3rd lines.