Colonel Christopher John Parker was commissioned a Chemical Officer upon graduation from Officer Candidate School Class 1-78, 22 February 1978. His first duty assignment was as Assistant Chemical Officer, 2nd Brigade, 25th Infantry Division, Schofield Barracks, Hawaii. | His subsequent duty assignments include: Chemical Officer, 2nd Brigade, 25th Infantry Division, Schofield Barracks, Hawaii; NBC Element Officer, Headquarters and Headquarters Company, 7th Infantry Division, Fort Ord, California; Assistant Division Chemical Officer, Headquarters and Headquarters Company, 7th Infantry Division, Fort Ord, California; NBC Element Director, Headquarters and Headquarters Company, 7th Infantry Division, Fort Ord, California; Doctrine Writer, Headquarters and Alpha Company, U.S. Army Chemical School, Fort McClellan, Alabama; Company Commander, Company E, U.S. Army Chemical School, Fort McClellan, Alabama; Executive Officer, Headquarters and Headquarters Company, 84th Chemical Battalion, Fort McClellan, Alabama; Systems Acquisition Manager, Headquarters Dugway Proving Ground, Dugway, Utah; Chief of Operations, Test Section, Headquarters Dugway Proving Ground, Dugway, Utah; Assistant Project Manager, Mask, Soldier, Biological and Chemical Command, Aberdeen, Maryland; Assistant Project Manager, Test, Soldier, Biological and Chemical Command, Aberdeen, Maryland; Product Manager, Smoke and Obscurants, Soldier, Biological and Chemical Command, Aberdeen, Maryland; Professor, Defense System Management Collage, Alexandria, Virginia; Staff Officer, The Pentagon, Washington, D.C. and Product Manager, Nuclear, Biological, and Chemical Defense Systems, Soldier Biological, and Chemical Command.