Here are the dangerous and intense methods the US Navy uses to keep its warships supplied at sea

“UNREP,” short for “underway replenishment,” is the term used to describe the transfer of fuel, food, ammunition, repair or replacement parts, people, and mail from supply ships to combatants like frigates, destroyers, and aircraft carriers. "VERTREP," short for "vertical replenishment," supplies ships via back-and-forth flights with helicopters. Both of these methods for supplying ships are dangerous but necessary.
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