It's cheaper to get a human pilot to do the same things a UAV will. If you spend $300 million in R&D on a UAV program, plus $15 million for the drone itself, it will be able to take off, find a target, take pictures of it, send them back to base, and subsequently get shot down by some dude with a cheap SA-18.
Compare those hundreds of millions to spending $10000 in recruiting a guy and putting him up at flight school, maybe another $30000 in fuel over a few months, and say $1.2 million on a tricked-out OV-10 (for example,
http://www.volanteaircraft.com/ov-10.htm) with guns and rocket pods. Procure about 100 of these, and paint them in cool tiger stripe camo.
Put another dude in back (we're up to $1.24 million) with a $500 Nikon, $4000 worth of flight gear and body armor, a few $1 Clif Bars, a sweet $500 in-plane stereo system, and a couple of $1000 pistols, and an endless supply of weapon stores, and you have your bad-ass terrorist-hunting MAV. What 18-year-old could resist? 200 feet, under the radar, and 300 knots, listening to "Thunderstruck" as you roll in on an Al Qaeda stronghold. ****, it's better than street racing your beat-up Civic...
Call it the Joint Air Assault Corps (JAAC 'em before they hijack us), have the Navy and Marines train the pilots, pull them out of high school and make them WOs like the Army does, and call it a 3-year tour with full benefits, college incentives, leave in the South Seas and a $10000 bonus for targets hit successfully. Tax-free, of course.
Grand total: maybe $1.5 to 2 million per plane/pilot/wso unit. Contract maintenance will do nicely, so long as they're careful with the rockets. I just saved 90% on my anti-terrorist insurance.