 Studies of the difficulties encountered in Army UAV programs indicate that participants tended to underestimate the complexity of a UAV system, starting out thinking that UAVs are little more than glorified RC model airplanes, and then were overwhelmed as problems mounted.On the other hand, some defense engineers approached UAVs with the same mindset as they would use for building a piloted aircraft, causing costs to skyrocket.There also seems to have been problems from inter-service squabbling and Congressional micromanagement.