Few Marines fighting in treacherous conditions in Chosin, North Korea, took the handout seriously saying that they would be served a sumptuous dinner that Thanksgiving in 1950. After all, Chosin was rapidly turning into the bloodiest battle in the war, with 15,000 U.N. troops, mostly of the 1st Marines, under attack by 120,000 Communist soldiers. So when the men saw the menu boasting of roasted stuffed olives, sweet pickles, roast young tom turkey with cranberry sauce, sage dressing, giblet gravy, green peas, buttered corn, mashed potatoes and candied sweet potatoes, they were less than credulous, describing it, in the words of one serviceman, as "the Last Supper before the Charge of the Light Brigade into the Valley of Death." But one member of the Chosin Few, the small group of U.S. Marine survivors of the battle, never forgot that promised meal. And on Saturday, Jim Gunn of Miami will sit down with about 100 former Leathernecks to finally bite down on that promised bird. "They're going to get that turkey dinner, just like it was on the menu," said Gunn, 56, a retired lobbyist who served as a supply sergeant during the war and who, for the sake of a meal never consumed, will turn mess sergeant for a day.