Unlike pilots, unmanned aircraft or ‘drones’ don’t have hearts and they are never tired. These may be big for a ship, but they are very small for an airport. However, their hearts went even faster at the end of the flight, when they had to land their jets on an aircraft carrier. Flying though Hanoi’s air defenses understandably raised their pulse. During the war in Vietnam, the US Navy monitored the heart rates of some of their pilots.
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