Colonel Warren T. Lillie was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 1-60, 18 December 1959. His first duty assignment was as an Instructor, A Company, 2nd Battle Group, 23rd Infantry, Fort Benning, Georgia. | His subsequent assignments include: Instructor, Patrolling, D Company, United States Army Infantry School, Fort Benning, Georgia; Aide-de-Camp, Commanding General, Fort Benning, Georgia; Aide-de-Camp, Commanding General, I Corps, Korea; Platoon Leader, A Company, 1st Brigade, 17th Infantry, Camp Kaiser, Korea; Advisor of Training, and later the Assistant G-3 Advisor, Military Assistance Advisory Group, Hue, Vietnam; Commander, C Company, 1st Battalion, 511th Infantry, Fort Benning, Georgia; S-3 Air, Headquarters Company, 2nd Brigade, 1st Cavalry Division, Anhkhe, Vietnam; Assistant Professor Military Science, University of Pittsburgh, Pittsburgh, Pennsylvania; Chief of Operations Division, XVII Airborne Corps, Fort Bragg, North Carolina; Division Operations Office (G¬3), 101st Ain-nobile Division, Fort Campbell, Kentucky; Brigade Executive Officer, 2nd Brigade, 101st Airmobile Division, Fort Campbell, Kentucky; Battalion Commander, 1St Battalion, 501st Infantry, Fort Campbell, Kentucky; Senior Advisor, Advisory Group, Saudi Arabia; Senior Advisor, 99th Advisory Group, Oakdale, Pennsylvania; Chief Readiness Group, 99th Advisory Group Pennsylvania and West Virginia, Oakdale, Pennsylvania.