Colonel Gregory Randal Bell was commissioned as an Infantry Officer upon graduation from Infantry Officer Candidate School Class 1-93 at Fort Benning, Georgia, 28 January 1993. He reported to his first duty assignment as Platoon Leader, A Company, 1st Battalion, 6th Infantry Regiment.

His subsequent duty assignments include: Executive Officer, D Company 1-6th IN Battalion; Executive Officer and BMO HHC 2-2 IN; Brigade S3 Air, 3rd IBCT, 101st Air Assault Division; Commander, A Co, 1-187th Infantry Brigade; OC JRTC; Operational Advisor, OPM-SANG, Saudi Arabia National Guard; Deputy Chief of OPS, 101st Air Assault Division, Battalion S3 2/502d IN Battalion; Brigade S3 Operations Officer, 2/502 IN Brigade; Lead Global Force Manager (GFM) US Africa Command (Earned Field grade of the year award); Commander, 3rd Battalion, 7th Infantry Regiment; NWC Student and Faculty, US Naval War College; Director, TRADOC Capability Manager- Infantry (TCM-IBCT); Director, Soldier Requirements Division (SRD); Chief of Staff for the Soldier Lethality Cross Functional Team (SL SFT). Colonel Bell retired 01 October 2022.

His military education and training consists of: 29Y SATCOM Course, Airborne School Air Assault School, Ranger School, Bradley Leaders Course, Infantry Officer Basic and Advanced Courses, Combined Armed Services Staff School, Command and General Staff College, Jumpmaster Course, Joint Fire Power, Strategic Deployment Course, Sniper Leaders Course, JCRM & JOPES FM Course, BCT/BN Tactical Commander Course, JPME II Course, US Naval War College, and Requirements Management Courses. He is a graduate of the University of Georgia (BA), University of Central Michigan (MSA), US Naval War College (MS), and the Georgia Tech Program Management Program.

COL Bell's military awards and decorations include: Legion of Merit, Joint Meritorious Unit Award (w/OLC), Bronze Star (w/2 OLC), Meritorious Unit Citation, Defense Meritorious Service Medal, Superior Unit Award, Meritorious Service Medal (w/ Silver OLC), Joint Service Commendation Medal, Army Commendation Medal, Army Achievement Medal (w/2 OLC), Good Conduct Medal, National Defense Service Medal, Armed Forces Expeditionary Medal, Kosovo Campaign Medal, Afghanistan Campaign Ribbon (w/2 Stars), Iraq Campaign Ribbon (w/2 Stars), Global War on Terror Expeditionary Medal, Global War on Terror Service Medal, Overseas Service Medal (w/7 Bars), and the NATO Medal (w/OLC).