Captain Donald E. Donnay was commissioned an Infantry Officer upon graduation from Officer Candidate School, Class 4-65, 19 April 1965. His first duty assignment was as Platoon Leader, Company B, 3rd Battalion, 2nd Brigade (Advanced Infantry Training), Fort Ord, California. | His subsequent duty assignments include: Training Officer, Company B, 3rd Battalion, 2nd Brigade (Advanced Infantry Training), Fort Ord, California; Student Officer, Continental United States Class #7, Jungle Operations Center, Fort Sherman, Canal Zone; Liaison Officer, Headquarters, 90th Replacement Battalion, U.S. Army Pacific, Vietnam; Assistant Operations Officer, Headquarters, 90th Replacement Battalion, U.S. Army Pacific, Vietnam; Company Commander, 178th Replacement Battalion, U.S. Army Pacific, Vietnam; Project Evaluator, Ground Combat Division (Counterinsurgency), Army Concept Team, U.S. Army Vietnam, Republic of Vietnam; Temporary Duty, Project Oregon, U.S. Army Vietnam; Assistant Headquarters Commandant, Temporary Duty, Headquarters, Task Force Oregon (Provisional) U.S. Army Pacific Vietnam; Military Assistance Command Vietnam, Liaison Officer, Headquarters Special Troops, U.S. Army Vietnam (Temporary Duty, Singapore); Company Commander, (Counterinsurgency) Company A, 2nd Battalion, 39th Infantry, 9th Infantry Division, U.S. Army Pacific, Vietnam; Staff Officer, Doctrine Branch, Concept and Doctrine Division, U.S. Army Combat Development Command, Institute of Special Studies, Fort Belvoir, Virginia; Combat Development Staff Officer, Doctrine Branch, Concept and Doctrine Division, United States Army Combat Development Command, Institute of Special Studies, Fort Belvoir, Virginia; Battalion S-4, Headquarters and Headquarters Company, 1st Battalion, 5th Infantry, 1st Brigade, 25th Infantry Division, United States Army Pacific (Hawaii) Schofield Barracks, Hawaii; Chief, Range Branch, Director of Plans, Training and Security, United States Army Pacific (Hawaii), Schofield Barracks, Hawaii; Operations/Training Officer, United States Army Junior Reserve Officer Training Corps Instructor Group, Fort Shafter, Hawaii; Emergency Actions Staff Officer, Deputy Chief of Staff for Operations and Plans, 6th Army Headquarters, Presidio, San Francisco, California.