the United States. Since the inception of Drum Corps International in the 1970s, many marching bands that perform field shows have adopted changes to the activity that parallel developments with modern drum and bugle corps. These bands are said to be corps-style bands. Areas where changes have been adopted from drum corps include: Marching: instead of a traditional high step, drum corps tend to march with a fluid glide step, also known as a roll step, to keep musicians' torsos completely still. Recently, corps and marching bands have been moving from the glide step to a more straight-leg style. This is a slightly different movement with a similar approach. The biggest difference being a crisp straight leg instead of a noticeable bend in the knee for glide step. Auxiliaries: adaptation of the flag, rifle, baton and sabre units into auxiliaries, who march with the band and provide visual flair by spinning and tossing flags or mock weapons and using dance in the performance. Percussion: moving marching timpani and keyboard percussion into a stationary sideline percussion section, or "pit", which has since incorporated many different types of percussion instruments such as: tambourines, crash cymbals, suspended cymbals, bass drum and gong sets, chimes, EWI's (electronic woodwind instrument), and most keyboards. Competitions: marching band competitions are judged using criteria similar to criteria used in drum corps competitions, with emphasis on individual aspects of the band (captions for music performance, visual performance, percussion, guard (auxiliary), and general effect are standard). Military style Military bands or corps of drums were historically the first marching bands. Instrumentation in these bands varies but generally consists of brass, woodwinds, and percussion. Due to their original purpose, military marching bands typically march in a forward direction with consistent straight lines. Music is performed at a constant tempo to facilitate the steady marching of the entire military group the band is playing with. The marching step size, or interval, is consistent, and usually at a 6 to 5 (six steps per five yards) or 8 to 5 (eight steps to five yards). This style includes field music units such as drum and bugle corps or bugle bands and/or fanfare bands, pipe bands, and fife and drum corps, as well as police bands of police and fire departments. As a general rule, active-duty military marching bands often perform in parades with other military units and march in the same manner as