Sea water is in an almost unlimited supply, and at the same time, the globe is faced with ongoing challenges in finding inexpensive fuel sources. The
US military maintains a fleet
of 15 oil tankers, which are used to supply fuel to other units. The process of re-fueling is delicate, and must be handled very carefully as units, such as jets and helicopters must leave operations or theater for refueling, which can be even trickier in bad weather.