Re: mortar kills

@Lo1snake Operations would be your best bet as people are usually grouped up on the flags, especially if you're on the attacking side. Argonne would be decent and the first sector on Ballroom Blitz should work well too. Just take your time and pummel the red dots on your mini-map.

Weirdly I found the two plane kills very easy. There are a couple of ways to knock that one out. Some assignments are a real struggle though for sure.