Colonel Olen L. Kelley was commissioned an Signal Corps Officer upon graduation from Officer Candidate School class #1-85, 22 February 1985. His first duty assignment was as a Platoon Leader, 16th Signal Company, 40th Signal Battalion, 11th Signal Brigade, Fort Huachuca, Arizona. | His subsequent duty assignments include: Battalion Maintenance Officer, HHD, 40th Signal Battalion, 11th Signal Brigade, Fort Huachuca, Arizona; Company Commander, 69th Signal Company, 11th Signal Brigade, Fort Huachuca, Arizona and Saudi Arabia; Staff Officer, J6, Pentagon, Washington, D.C.; S3, Bagnoli Communications Squadron, Southern Region Signal Support Regiment, Bagnoli, Italy; Brigade Assistant S3, Operations Officer, Southern Region Signal Support Regiment, Bagnoli, Italy and Zagreb, Croatia; Brigade S4, 1st Signal Brigade, Yongsan, Korea; Battalion Executive Officer, 307th Signal Battalion, 1st Signal Brigade, Camp Carrol, Korea; SPJ38 Plans Officer, USSPACECOM/USNORTHCOM, Peterson Air Force Base, Colorado; Battalion Commander, 56th Signal Battalion, 11th Signal Brigade, Fort Gordon, GA; Division Chief, J655 Plans and Policy, USNORTHCOM, Peterson Air Force Base, Colorado; Assistant Chief of Staff G6/Chief Information Officer, U.S. Army Central Command, 3rd Army, Fort McPherson, Georgia and Camp Arifjan, Kuwait; Assistant Chief of Staff G6/Chief Information Officer, U.S. Army Cyber Command, Fort Meade, Maryland; Vice Director, Joint Information Environment Technical Support Office, DISA, Fort Meade, Maryland. | Following retirement, COL Kelley continued to serve the U.S. working as a civilian for MITRE Corporation in support of USCYBERCOM and the Department of Defense.