Assigned to a support role with the amphibious forces, Wyandot — partially unloaded — was returning from a night retirement alert about 0400 on 29 March when a Japanese horizontal bomber, probably on a night heckler mission, came in off Wyandot's starboard quarter and dropped a pair of bombs, one of which hit close aboard the ship's starboard quarter, sprinkling her stern with what appeared to be picric acid.

The second bomb plunged into the water near the attack cargo ship's starboard side and scored an underwater hit, making two large cracks in her hull.

Putting the remainder of her landing craft and boats in the water, the vessel painfully made her way to an advanced repair base, down by the bow and steaming slowly, but still afloat.

Wyandot, her mission at Okinawa completed, sailed for the west coast of the United States, via Pearl Harbor, for permanent repairs and reached the Naval Dry Docks at Terminal Island, San Pedro, California, on 6 June.

Departing Trinidad on 8 March, the attack cargo ship took part in further exercises before she made a transatlantic passage to Casablanca, French Morocco.

Again operating off the eastern seaboard early that summer, Wyandot subsequently headed for her first deployment in Arctic waters, departing Boston on 16 July 1947 for Thule, Greenland, and Devon and Cornwallis islands.

Returning to Boston on 25 September, Wyandot spent the next year operating along the eastern seaboard and gulf coast of the United States, as well as making two cruises to the Caribbean and one to Panama.

Early in 1951, Wyandot was selected to participate in Operation Blue Jay, transporting construction materials to the northern part of Greenland—and was busy in that mission from May to September of that year.

The following year, Wyandot conducted logistical support missions in the Caribbean and later participated in the joint United States and Canadian resupply operations with Arctic weather stations.