George Haidemenos was an avid drum corps historian who also performed in the horn line of the Marksmen, of Springfield, Massachusetts, from 1961 until 1969. He returned to the horn line when the alumni corps was formed 20 years later, marching and performing until the year 2000. The Marksmen Senior Drum and Bugle Corps was founded in 1957, appearing in many parades throughout the northeast and competing in drum corps competitions in the Yankee Circuit, winning many awards and top honors. The Marksmen also successfully competed in national competitions, with appearances up and down the east coast, including New York’s Carnegie Hall and Shea Stadium. In the 1960s, during the Vietnam War, many members were called to military duty. Because of the great number entering military service, the corps was forced to disband in 1969. The alumni corps was formed in 1989, following a corps reunion.