USCGC Anthony Petit (WLM-558) is a Keeper-class coastal buoy tender of the United States Coast Guard.

Speakers at the christening ceremony included Alaska Senator Frank Murkowski, and Coast Guard Commandant Admiral James Loy.

[8] Rather than building the ship from the keel up as a single unit, Marinette Marine used a modular fabrication approach.

[5] The ship has two Caterpillar 3508 DITA (direct-injection, turbocharged, aftercooled) 8-cylinder Diesel engines which produce 1000 horsepower each.

Keeper-class ships were the first Coast Guard cutters equipped with Z-drives, which markedly improved their maneuverability.

[5] Her tanks can hold 16,385 gallons of diesel fuel[8] which gives her an unrefueled range of 2,000 nautical miles at 10 knots.

This gives Anthony Petit the ability to hold position in the water even in heavy currents, winds, and swells.

[11] Anthony Petit, as all Keeper-class ships, has a strengthened "ice belt" along the waterline so that she can work on aids to navigation in ice-infested waters.

Higher grades of steel were used for hull plating in the ice belt to prevent cracking in cold temperatures.

[13] The ship's namesake is U.S. Coast Guard Chief Boatswain's Mate Anthony Petit, the keeper of the Scotch Cap lighthouse on the west end of Unimak Island in the Aleutians.

[14] After her launch and sea trials, Anthony Petit sailed down the Great Lakes, the Saint Lawrence Seaway, and through the Panama Canal to reach Ketchikan, Alaska, her homeport for her entire career.

She has participated in several joint United States-Canada exercises to prepare for a possible spill in the Dixon Entrance area.