Question: What does seal stand for in the U.S. military branch that operates a list of destroyer classes, as well as the USS Sable?

Knowledge 1: List of destroyer classes of the United States Navy
The first major warship produced by the U.S. Navy after World War II (and in the Cold War) were "frigates"—the ships were originally designated destroyer leaders but reclassified in 1975 as guided missile cruisers (except the became guided missile destroyers). These grew out of the last all-gun destroyers of the 1950s. In the middle 1970s the s entered service, optimized for anti-submarine warfare. A special class of guided missile destroyers was produced for the Shah of Iran, but due to the Iranian Revolution these ships could not be delivered and were added to the U.S. Navy. [SEP] Knowledge 2: USS Sable (IX-81)
USS "Sable" (IX-81) was a training ship of the United States Navy during World War II. Originally built as the passenger ship "Greater Buffalo", a sidewheel excursion steamer, she was purchased by the Navy in 1942 and converted to a training aircraft carrier to be used on the Great Lakes. Lacking a hangar deck, elevators or armament, she was not a true warship, but provided advanced training of naval aviators in carrier takeoffs and landings. [SEP] Knowledge 3: Seal Online
After two years, a website was created for Seal Online. It had a post announcing the arrival of Seal Online in English to the United States. The English Seal Online was finally released on 19 November 2007 at 8pm EST by YNK Interactive.
Knowledge 1: List of destroyer classes of the Royal Navy
This is a list of destroyer classes of the Royal Navy of the United Kingdom, organised chronologically by entry into service. [SEP] Knowledge 2: HMS Seal (1897)
HMS "Seal" was a B-class torpedo boat destroyer of the British Royal Navy. She was completed by Laird, Son & Company, Birkenhead, in 1897. [SEP] Knowledge 3: USS Sable (IX-81)
USS "Sable" (IX-81) was a training ship of the United States Navy during World War II. Originally built as the passenger ship "Greater Buffalo", a sidewheel excursion steamer, she was purchased by the Navy in 1942 and converted to a training aircraft carrier to be used on the Great Lakes. Lacking a hangar deck, elevators or armament, she was not a true warship, but provided advanced training of naval aviators in carrier takeoffs and landings.
Knowledge 1: List of destroyer classes of the Royal Navy
This is a list of destroyer classes of the Royal Navy of the United Kingdom, organised chronologically by entry into service. [SEP] Knowledge 2: HMS Seal (1897)
HMS "Seal" was a B-class torpedo boat destroyer of the British Royal Navy. She was completed by Laird, Son & Company, Birkenhead, in 1897. [SEP] Knowledge 3: United States Navy SEALs
The United States Navy's ``Sea, Air, and Land ''Teams, commonly abbreviated as the Navy SEALs, are the U.S. Navy's primary special operations force and a component of the Naval Special Warfare Command. Among the SEALs' main functions are conducting small - unit maritime military operations that originate from, and return to, a river, ocean, swamp, delta, or coastline. The SEALs are trained to operate in all environments (Sea, Air, and Land) for which they are named.

Answer: Sea, Air, and Land