USS Lyon (AP-71) was a type C3 ship of the United States Navy which played an extensive role in naval transportation during World War II.

Mormactide was operated by Moore-McCormack for WSA under a standard Army Transportation Corps agreement until 8 August 1942 when the ship was transferred to the Custody of the War Department.

[4] From 13 December 1942 to 11 March 1943, Lyon made two voyages between New York City and Oran, Algeria, transporting reinforcements for the campaign in North Africa.

[4] Lyon next departed Mers el Kebir, Algiers on 6 July, with units of the Army's 1st Infantry Division for the assault on Gela, Sicily.

The troops on the Lyon disembarked safely in stormy weather on 10 July for the initial advance into what had been called Europe's "soft underbelly".

The vessel sailed from the battle area on 12 July and arrived back in Algeria three days later to prepare for the next assignment, the Salerno landings.

The landings were successful despite heavy enemy fire, air attacks, and complications resulting from a false report of Italy's surrender.

[4] She sailed from Naples on 13 August as part of a combined British-French-United States operation to land in the St. Tropez area of southern France.

She returned to Okinawa on 21 July and embarked veteran marines bound for Guam to prepare for the planned assault on the Japanese home islands.

[4] After two voyages to the Far East between August and November transporting occupation troops and returning veterans, Lyon arrived in San Francisco on 3 February 1946.

She departed Oakland, California, on 2 March with 1,000 German prisoners of war bound for Liverpool, England, and returned to New York on 12 April.