From Strategy Page:
Drones are taking over the Air Force
The United States Air Force will reach a milestone this year: for the first time it will train more pilots for unmanned aircraft than for manned aircraft. A decade ago unmanned aircraft were hardly known. Now they dominate the Air Force’s pilot training system and it is very unlikely this trend will ever reverse. In fact, it is not hard to imagine that within another decade unmanned aircraft operations will dominate day-to-day Air Force operations, force planning decisions, and budgets.
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Update: UAVs are Kings of the Skies -- New Wars
My Comment: A succinct summary from Strategy Page on the growth and development of UAVs in the U.S. military.