A blue aiguillette is worn on the left shoulder by military training leaders at technical training bases. Student airmen leaders at technical training bases (sometimes called "ropes" in reference to the aiguillette) also wear aiguillettes, with green representing the lowest level of student leadership, yellow representing the intermediate level of student leadership, and red representing the highest level of student leadership. Students wearing a white rope are commonly referred to as chapel guides, and are charged with providing social or moral support to their fellow airmen. Airmen who wear the black rope are experts in drill, choir, or ceremonies, and pride themselves on appearance and uniform wear. Airmen who wear a blue and white rope are members of the drum & bugle corps for their base. In the United States Air Force, honor guard members wear a silver aiguillette on the left shoulder.