Retired Navy Cmdr. Donald B. Meek, 50, a combat veteran of the Korean conflict who later served on Gen. William Westmoreland's staff in Vietnam and commanded the presidential yacht Sequoia, died Tuesday in the Salt Lake City Veterans Hospital. He had amyotrophic lateral sclerosis, also known as Lou Gehrig's disease.

Cmdr. Meek was born in Ithaca, N.Y., and was a 1950 graduate of the U.S. Naval Academy at Annapolis. He served aboard a minesweeper in Korean waters during the conflict there, and destroyers in both the Atlantic and Pacific.

He commanded the Sequoia from 1959 to 1962, then spent a year as a seamanship and navigation instructor at the Naval Academy. After serving on Westmoreland's staff as a Navy liaison officer in the mid-1960s, he worked on the staff of the Center of Naval Operations for six years before retiring from active duty in 1975.

His decorations included the Bronze Star Medal, which he earned in Vietnam.

During his years in Washington, Cmdr. Meek was active in the Washington Ski Club. A ski instructor and judge, he was a former president of the International Freestyle Judges Association. At the time of his death, he was director of the free-style skiing program at the Utah Academy of Gymnastics in Salt Lake City.

He is survived by a sister, L. Jean Meek, of Chesire, Conn.