Lt. Col. Major Clark served with the 597th Field Artillery Battalion in WWII and Korea. His 20-year-plus Army career culminated at the Pentagon. During his career, Clark earned 12 medals and citations. As a civilian, Clark continued his efforts to recognize and reward black military achievements. One of Clark’s greatest achievements was working behind the scenes to bring about the awarding of Medals of Honor to seven African American World War II veterans. Clark was invited to the White House ceremony by President Bill Clinton for his efforts. He was the battalion's troop historian.