Born to prisoners of a labor colony on Kalist VI, Ralter had no concept of freedom until he met a Rebel pilot imprisoned in the colony. The pilot told Ralter of the world beyond Kalist VI, and together they plotted an escape. Ralter managed to get away, but the Rebel pilot died during the effort.

To honor the man responsible for his freedom, Ralter joined the Rebel Alliance pilot corps. He underwent a rapid training program and was deployed at Echo Base with Rogue Squadron as Rogue Six. During the Battle of Hoth, Ralter served as Luke Skywalker's gunner. As Luke and Dak prepared to make the first attack run on an AT-AT using their snowspeeder's tow cable, a direct hit on the rear of the vehicle from one of the walkers likely killed Dak instantly, and any chance of his survival was thwarted when a walker trampled the speeder as it passed.