Colonel John Charles Lamb was commissioned an Infantry Officer upon graduation from Officer Candidate School Class 1-60, 18 December 1959. His first duty assignment was as Platoon Leader, Company E, 2nd Battle Group, 9th Infantry, Fort Benning, Georgia. | His subsequent duty assignments include: Mortar Committee Chief, 2nd/ 9th Infantry Division, Fort Benning, Georgia; Commander, Heavy Mortar Platoon, 2nd/ 9th Infantry, Fort Benning, Georgia; Commander, Company D, 2nd/ 9th Infantry, Fort Benning, Georgia; Commander, Company C, 2nd/ 6th Infantry, Berlin, Germany; Assistant G-3 Air, Berlin Brigade, Berlin, Germany; G-3 Advisor, 23rd Infantry Division (Vietnamese), Ban Me Thout, Vietnam; Senior Advisor, 45th Regiment, 23rd Division Vietnamese) Republic of Vietnam; S-4, 3rd Training Brigade, Fort Jackson, South Carolina; S-3, 1st/ 506th Infantry Battalion, 101st Airborne Division, Republic of Vietnam; Chief, Out-Country Order of Battle, Combined Intelligence Center, Vietnam; Chief, Curriculum Division, Army Intelligence School, Fort Huachuca, Arizona; Commander, 1st Student Battalion, Army Intelligence School, Fort Devens, Maryland; G-2, 7th Infantry Division, Fort Ord, California; Tactical Intelligence Officer, ACS for Intelligence, Washington, D.C.; Inspector General, ACS for Intelligence, Washington, D.C.; Staff Officer, Deputy Undersecretary of Defense, Policy, Washington, D.C.; Commander, 205th MI Brigade, V Corps, Frankfurt, Germany; G-2, V Corps, Frankfurt, Germany; Executive Officer, Deputy Chief of Staff, Intelligence, Washington, D.C.