Colonel Stephen A. Nash was commissioned an Infantry Officer upon graduation from Officer Candidate School 23 January 1970. His first duty assignment was as Platoon Leader, 1/58th Infantry (Mechanized), 197th Separate Infantry Brigade, Fort Benning, Georgia. | His subsequent duty assignments include: Rifle Platoon Leader, 2d Battalion, 46th Infantry, 1st Armored Division, Fort Hood, Texas; Rifle Platoon Leader, 1st Battalion, 5th Cavalry, 1st Cavalry Division, Fort Hood, Texas; Cobra Pilot, A Troop, 2d Battalion, 17th Cavalry Division, 1Olst Airborne Division,  Vietnam; Pathfinder Detachment Commander, Headquarters and Headquarters Company, 229th Aviation Battalion, 1st Cavalry, Vietnam; Battalion Operations Officer, 2d Battalion, 1st Basic Training Brigade, Fort Jackson, South Carolina; Company Commander, 2d Battalion, 1st Basic Training Brigade, Fort Jackson, South Carolina; Battalion S-4, 2d Battalion, 15th Infantry, 3d Infantry Division, Wildflecken, Germany; Company Commander, 2d Battalion, 15th Infantry, 3d Infantry Division, Wildflecken, Germany; Inspector General, Headquarters and Headquarters Company, Quartermaster Center, Fort Lee, Virginia; Deputy G-4, Headquarters and Headquarters Company, 3d Infantry Division, Wurzburg, Germany; Battalion Executive Officer and Brigade Executive Officer, 3d Brigade, 3d Infantry, Aschaffenburg, Germany; Battalion Commander, 4th Battalion, 7th Infantry, 3d Infantry Division, Aschaffenburg, Germany; and Chief, Tactics Division, U.S. Army Infantry Training Center, Fort Benning, Georgia; Commander, 3d U.S. Infantry (The Old Guard), Fort Myer, Virginia.