1.  Experiments with blindfolded pigeons have shown that birds are no more able to fly without a visual reference than are human pilots.

2.  But Pentagon planners are anxious to keep the risk of casualties to an absolute minimum in this operation, and cruise missiles do not require human pilots or crews.

3.  Flying at supersonic speeds puts a huge strain on human pilots, the equivalent of the pressure of multiple Earth gravities.

4.  The camera has full panning and tilting capability and is operated by a human pilot with a remote control.

5.  His unit was responsible for guarding a strip of coastline with torpedoes that required a human pilot.