Colonel Joseph D. Hynes was commissioned an Infantry Officer upon graduation from Officer Candidate School 4 November 1944, class number 354. His first duty assignment was as Platoon Leader, Replacement Training Centers, Camp Livingston, Louisiana. | His subsequent assignments include: Platoon Leader, 158th Regimental Combat Team, Japan; Executive Officer, 3774th Truck Company, Japan; Platoon Leader - Heavy Mortar Company, Company I, 14th Regimental Combat Team; Asst S-3 - 3d Battalion, 14th Regimental Combat Team, Fort Carson, Colorado; Platoon Leader, Co K; Asst S-3, 3d Bn; Asst Regiment’l S-3; Bn S-3, 1st Bn, Korea; Asst PMS&T, San Diego High Schools ROTC, San Diego, California; Company Commander, Co A; Company Commander, Co D; Regimental Combat Team S-1; S-3, 1st Bn; Asst Regimental S-3; Action Officer, Plans Br, G-1 Section; Assistant Secretary of the General Staff- Headquarters Sixth U.S. Army Presidio of San Francisco; San Francisco, California; Assignment Officer, Officer Assignment Directorate, D.CSPER, Dept of the Army, Infantry Branch, Pentagon; Staff Officer, Advanced Studies Group, ODCSPER, Dept of the Army, Pentagon; Assistant Executive Officer, Office of the Under Secretary of the Army, Pentagon; Battalion Commander, 1st Bn, 32d Infantry, 7th Inf Div, Korea; Author/Instructor, Command & General Staff College, Fort Leavenworth, Kansas; Mil Asst to the Commanding General, Team Chief, Directorate of Conceptual Design, Institute of Land Combat, USA Combat Developments Command, Fort Belvoir, Virginia; Brigade Commander, 4th Brigade, USATC, Infantry, Fort Ord, California.