Possible Clues:

• Adm. or capt.'s org., perhaps
• ''Anchors Aweigh'' gp.
• Salts are in it: Abbr.
• Milit. branch
• Swabs' grp.
• J.F.K. was in it
• Inits. at sea
• Swabber's org.
• Captain's org.
• Some capts. are part of it