During the Vietnam war, they fitted a Navy pilot going "Downtown" Hanoi with a heart monitor. His heart rate went up when he was launched. Once in the air, his rate went down. It increased again when he went feet dry. His heart rate went higher still when he reached the SAM belt. His heart rate decreased when he egressed the SAM belt. It went lower still when he went feet wet. It then climbed to a rate higher than it been during the flight when he was in final for a night recovery on a pitching deck.
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