Jane's Longbow 2 currently.
I got through the Azure Rune campaign by a breeze (it's like a Red Flag Tactical Exercise in Texas, however I have yet to try it when the OPFOR has US military equipment), but Fallen Crescent (the "real thing" happening in Azerbaijan)... well, making a lot of progress (ground forces have pushed deep into the northeastern sector and about a few days short of taking a major city, but the southern section is still contested), but I lost about 8 helos and their crews over the course of the campaign.
Oh, and no, I'm not going "easy-mode" with Radar Longbows + RF Hellfires. 80% of the flights I'm forced to take has a non-Radar Bow (because I set limitations to Radar Bows and the weapons, but fresh supplies come in every other day), so Laser all the way. I have about 700 HE FFARs a FARP and have no idea what the hell to do with all of that.
EDIT: Also, Sinistar. Ow ****, my hands. Freaking fifty thousand points.
YET ANOTHER EDIT: Alright, I did it! I beat Fallen Crescent! Damn, that took too long though. I should set the war length cap to four weeks...