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I think I an clarify this a bit
As I am in the Navy and have indulged in swim call more than once...
The gunner is not necessarily a marksman.
The area is usually cleared of sharks with active sonar pings first.
The swim area is one not frequented by sharks anyway.
The gunner is there to make the swimmers felel better.
Bullets are not dangerous below five feet or so.
Sharks are not visible below ten feet and not more than 50 feet away.
There is a picket boat a quarter mile out to keep sharks and other creepies away with the sound of the propeller as well as pick up errant swimmers.
That's about it.
Brian
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