Colonel Charles K. Nulsen Jr. was commissioned upon graduation from Officer Candidate School at the Ground General School in Fort Riley, Kansas on 2 December 1944.  His first duty assignment was as Platoon Leader, Company H, 351st Infantry Regimen, Trieste. | His subsequent duty assignments include: Aide-de-Camp, Commanding General TRUST, Trieste; Platoon Leader, E Company, 351st Infantry Regiment, Trieste; Company Commander, Companies L & I, 351st Infantry Regiment, Trieste; Company Commander, Companies K and Headquarters, 511th Air, Fort Campbell, Kentucky; Instructor, UW Department, Special War School, Fort Bragg, North Carolina; Senior Advisor, Phuoc Binh Thanh Spec Zone, Republic of Vietnam; Plans Officer, Tactical Department, Office of Military Instruction, United States Military Academy (USMA), West Point, New York; S3 and Battalion Commander, 3d Battalion, 21st Infantry, 196th Light Infantry Brigade, Fort Devens, Massachusetts and Tay Ninh, Republic of Vietnam; Chief, USMA/OCS Branch, Deputy Chief of Staff for Personnel, Department of the Army, Washington, D.C.