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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.
to fasten with (or as with) a seal, c.1200, from seal (n.1). Meaning to place a seal on (a document) is recorded from mid-14c.; hence to conclude, ratify, render official (late 15c.). Sense of to close up with wax, lead, cement, etc. is attested from 1660s, from the notion of wax seals on envelopes. In reference to the actions of wood-coatings, 1940. Related: Sealed; sealing. Sealing-wax is attested from c.1300. To seal (one's) fate (1799) probably reflects the notion of a seal on an execution warrant.