In case anyone is interested, here is a link to the USAF plan for operating RPAs.
In the USAF, each Predator / Reaper RPA crew comprises one Pilot and one Sensor Operator. The USAF has set a capability target of 65 x 24/7 RPA orbits by 2013 - 10 crews are required to sustain each orbit. This has created a requirement for 650 Sensor Operators. The USAF has now created a new
enlisted career field to satisfy this requirement.
RPA Ramp Up
As an aside, the linked article was published in June 2011 and there are already more RPA pilots than F-16 pilots in the USAF.