The U.S. Air Force continues to develop its acquisition strategy for Increment 2 of the service's Collaborative Combat Aircraft (CCA) program, which centers on fielding air-to-air drones to give the U.S. a boost in air superiority without having to rely on aerial refuelers. "With Increment 1, we were very focused on getting something to the ramp quickly so we focused on designs that had pedigree or already existed, and that kind of constrained the space," Air Force Col. John "KC"…