USS Lyman K. Swenson (DD-729), an Allen M. Sumner-class destroyer, was laid down on 11 September 1943 by Bath Iron Works, Bath, Maine and launched on 12 February 1944; sponsored by Miss Cecelia A. Swenson, daughter of Captain Swenson. The ship was commissioned at Boston Navy Yard on 2 May 1944.

The Allen M. Sumner class was a group of 58 destroyers built by the United States during World War II. Another twelve ships were completed as destroyer minelayers. The class was named for Allen Melancthon Sumner, an officer in the United States Marine Corps. Often referred to as simply the Sumner, this class was distinguished from the previous Fletcher class by their twin 5-inch/38 caliber gun mounts, dual rudders, additional anti-aircraft weapons, and many other advancements. The Allen M. Sumner design was extended 14 feet (4.3 m) amidships to become the Gearing class, which was produced in larger numbers but did not see significant service in World War II.