Colonel Giles Francis Crider was commissioned an Infantry Officer, 3 April 1969. His first duty assignment was as Training Officer, C Company, 2nd Battalion, 1st Brigade, U.S. Army Training Center, Fort Lewis, Washington. | His subsequent duty assignments include: Rifle Platoon Leader, Reconnaissance Platoon Leader and Company Commander, E Company, 1st Battalion, 12th Calvary, Quan Loi, Vietnam; Operations Officer, Company Commander and Range Control Officer, 3rd Army Noncommissioned Officer Academy, Fort McClellan, Alabama; S-3 Air Officer,  3rd Battalion, 47th Infantry, Fort Lewis, Washington; Company Commander, C Company, 3rd Battalion, 47th Infantry, Fort Lewis, Washington, Aide-de-Camp, Headquarters and Headquarters Company, 9th Infantry Division, Fort Lewis, Washington, Staff Officer, Office of the Deputy Chief of Staff for Operations and Plans, U.S. Army Europe, Heidelburg, Germany; Chief, G3 Training, Berlin Brigade, Berlin; Battalion Executive Officer, 4th Battalion, Berlin; Battalion Commander, 6th Battalion, Berlin; Infantry Team Chief, Deputy Chief of Staff for Operations and Plans, Washington, D.C.; Current Operations, J-3, U.S. Army Element, Office of the Joint Chiefs of Staff, Washington, D.C.; Brigade Commander, 2d Brigade, 6th Infantry (Light), Fort Wainwright, Alaska; Chief of Staff, Headquarters, 6th U.S. Army, Presidio, California; Director, Unified Joint Operations, U.S. Army War College, Carlisle Barracks, Pennsylvania; Chairman, DMSPO, U.S. Army War College, Carlisle Barracks, Pennsylvania. | At the time of his induction, Colonel Crider was serving as Chairman, Department of Military Strategy, Plans, and Operations, U.S. Army War College, Carlisle Barracks, Pennsylvania.