Jav,
As svoigt thingy says, there's still no substitute for the real thing, and the UAV's themselves need to be broken out for post maintenance test flts etc.
The Predator OCU includes about 3 live flts for the pilots (who are actually mostly rated pilots in their own right who log the flt time). Additionally, UAV's need to be integrated into trg such as Red Flag due to their increasing operational use.
Regards,
M2