Duncan K. Walsh was a human male serving in the Earth Starfleet in the mid-22nd century. In 2151, Ensign Walsh was assigned to the NX-class starship, Enterprise, as an engineer. In 2153, after the Enterprise returned to Earth for a refit, Walsh recorded a personal log noting the militaristic changes to the ship. He hoped that once the mission in the Delphic Expanse was complete, the Enterprise would return to its mission of peaceful exploration. (Star Trek Magazine Issue 162: "Blast Off!") Walsh continued to serve aboard the Enterprise until at least 2155. (ENT episode: "Terra Prime")