Yep, I was there long ago in my research. I believe the missing U.S. State Dept. combat crop duster counter-insurgency aircraft is an AY-65 Thrush, but with an uprated gas turbine and all kinds of stealthy stuff and countermeasures.
If you'd like to see a possible scenario I've come up with, e-mail me on FR, and I'll send you a link I have put up on the net. I don't want to post it here, and then be accused of being a tinfoil hat, or of posting sensitive militay information, or an being an anthrax scare monger.