Specialist Four Mark O. Yamane was born in Seattle, Washington. He joined the Army in June 1981. His Ranger training assignments included Texas, Washington, Wisconsin, Florida, Puerto Rico and Panama. Yamane’s additional training included earning the Jungle Expert Patch in June 1982, completion in September 1982 of HALO (High Altitude, Low Opening parachute) School. He served as a Rifleman, Assistant Machine Gunner, and Machine Gunner in A Company, 1st Battalion, 75th Ranger Regiment. Sergeant Yamane died in combat operations on 25 October 1983 in Grenada.