Major Coleman was selected for the Marine Corps Enlisted Commissioning and Education program in June 1990. He was commissioned in 1992, upon receiving his Bachelor of Arts degree from Norfolk State University. Following The Basic School, Major Coleman served in several platoon commander billets including Motor Transport Platoon Commander with 8th Motor Transport Battalion, Camp Lejeune, N.C. In November 1993, Major Coleman was assigned to 26th Marine Expeditionary Unit, where he served as a transportation commander and as a team embarkation officer. The unit participated in back-to-back Mediterranean deployments, which included contingency operations in the Indian Ocean in support of the U.S. policy in Mogadishu, Somalia, Operation Deny Flight in the Adriatic Sea and NATO efforts during Operation Joint Endeavor in Bosnia.
Upon his return to the United States, Major Coleman reported to 1st Battalion, Marine Corps Recruit Depot Parris Island, where he served as a series officer and later selected as Staff Secretary and Aide to the Commanding General of the Marine Corps Recruit Depot and the Eastern Recruiting Region. Upon graduation from the U.S. Army Advanced Logistics Officers Course in September 1999, he was assigned to assume command of the Inspector-Instructor Staff at Rock Island, IL. In May of 2002 he assumed command of the Houston MEPS and in 2004 he retired from that duty station.
Major Coleman enlisted in the Marine Corps in 1981. After completing basic training at Parris Island, S.C., Major Coleman served assignments at Fleet Marine Forces Atlantic, Norfolk, VA.; Headquarters and Headquarters Squadron, Kaneohe Bay, Hawaii; Marine Corps Recruit Depot San Diego; and Headquarters Marine Corps, Washington, D.C. During his enlisted years Major Coleman attained the rank of staff sergeant. He was also recognized as the NCO of the month, meritoriously promoted several times, and was the honor graduate at the non-commissioned officer course in San Diego, California in 1987.