General Wilhelm held a variety of command positions. He commanded a rifle platoon and company during two tours in Vietnam; served as a company commander in Headquarters Battalion and 3rd Battalion, 8th Marines, 2nd Marine Division; was the Senior Advisor to a Vietnamese Army Battalion; Inspector-Instructor, 4th Reconnaissance Battalion; Deputy Provost Marshal, U.S. Naval Forces Philippines; and commanded the 11th Marine Expeditionary Unit. General Wilhelm's staff assignments include Assistant Battalion Operations Officer; Operations Officer and Executive Officer, 1st Battalion, 1st Marines. He served on the staffs of III Marine Amphibious Force; Logistics, Plans, and Policy Branch, Installations and Logistics Department, HQMC, and J-3, Headquarters, U.S. European Command. In August 1988, while assigned as the Assistant Chief of Staff for Operations, II Marine Expeditionary Force, he was promoted to brigadier general, and was subsequently assigned as the Director of Operations, HQMC. In July 1990, he was selected to serve as Deputy Assistant Secretary of Defense for Policy and Missions, Office of the Assistant Secretary of Defense for Special Operations and Low Intensity Conflict. General Wilhelm assumed duties as Commanding General, 1st Marine Division, in July 1992. He served as Commander Marine Forces Somalia from December 1992 to March 1993 as part of the U.S. led coalition in Operation RESTORE HOPE. General Wilhelm was confirmed for promotion to lieutenant general and assumed duties as the Commanding General, Marine Corps Combat Development Command, Quantico, Virginia, July 15, 1994. In August 1995, he was assigned as Commander, U.S. Marine Corps Forces, Atlantic/Commanding General, Fleet Marine Force, Atlantic/Commander, U.S. Marine Corps Forces, Europe/Commander, U.S. Marine Corps Forces, South/Commanding General, II Marine Expeditionary Force/Commanding General, Marine Striking Force Atlantic, Camp Lejeune, North Carolina. He was confirmed for promotion to general and assumed duties as the Commander, U.S. Southern Command on September 25, 1997; he served in this position until October 2000. General Wilhelm retired from the Marine Corps on November 1, 2000.
Post-retirement
After retiring from the Marine Corps, General Wilhelm was a researcher with the U.S. Army War CollegeStrategic Studies Institute. General Wilhelm is Distinguished Military Fellow on the staff of the Center for Defense Information. In 2003, Wilhelm became Vice President at Battelle, responsible for homeland security issues.
