Sycamore, the withdrawal of the AD1, and A26 and all the gas powered apu's, tugs etc..... we're an attempt to reduce the logistics train more than anything. Not for lack of effectiveness. Many aircraft have been removed from service due to maintenance, spare parts issues, and other logistical reasons. The fact that there is no aerial opposition allows the use of lower performance, but more effective COIN craft. As such the increase in UAV flying, is due in part to a longer loiter time, pilot switching etc... that would be unfeasible in manned aircraft. However most UAV's have a reduced weapons load, reducing combat time. A new build OV10 w/ -12's a GAU19 and upgraded sensors would probably be a fantastic Coin System. I dare say they could even put in an autonomous pilot system, and increase the fuel load for increased loiter.