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The acronym SEAL in the United States Navy SEALs stands for Sea, Air, and Land. It is derived from the teams' ability to operate on the seas, in the air, and on land.
A navy Seal is a full time sailor or Marine assigned to the Seals. This is an individual who has completed Seal training and is assigned to a special ops unit or some such duty. Navy Seal are considered the creme de la creme of military personnel.