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With the advent of the radio, bugle signaling units became obsolete and surplus equipment was sold to veteran organizations (such as the Veterans of Foreign Wars and American Legion, two major organizers for classic drumcorps).
Drum and buglecorps have often been mistaken for marching bands, since there is a similarity to both groups having horns and drums; and they are both essentially bands of musicians that march.
Drum and buglecorps is, traditionally, a musical activity which extended the cameraderie of combat to a musical "battle" on (football)-sized fields.
Corps are colorfully and distinctively uniformed, although guard members typically wear more theatrical costumes that are largely predicated on the theme of the corps' musical presentation, which usually changes from year to year.
The first drum and buglecorps were signaling units within the military during the Civil War, and continued to exist through World War I. With the advent of the radio, the military found easier ways to communicate and found itself with a surplus of bugles and drums.
Until 2000, American drum and buglecorps hornlines were required to be pitched in the key of G. That year, the DCI rules congress passed a proposal to allow any key of brass on the field.