While there may not be a lot of downtime at sea, sailors and Marines make the most of their time off with "swim calls."
During these events, they are given permission to swim near the US vessel, while onlookers keep an eye out for sharks.
In honor of World Oceans Day, we've collected 21 photos showing that the US Navy and US Marine Corps have the best diving boards and swimming pools.
SEE ALSO: 19 photos of the Marine Corps' pursuit of perfection
A sailor from the USS Mobile Bay jumps into the Pacific Ocean.
Sailors assigned to the Arleigh Burke-class guided-missile destroyer USS Halsey swim in the Philippine Sea.
Sailors and Marines aboard the USS Essex run into the Celebes Sea.
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