One of the more demanding courses run by the Colombian Army is the Lancero School. This course – dedicated to counterinsurgency warfare – is held in Tolemaida, 150 miles (240 km) from Bogotá, where temperatures range between 85 and 100 degrees F. (29.5–38 degrees C.) throughout the year, with U.S. military instructors also playing a role. The course lasts 73 days and trains Bolivian, Ecuadorean, and Panamanian troops as well as Colombian soldiers; some French and American soldiers are also trained there. The course, founded in 1955, was based on the methodology of the United States Army Ranger School. Lethal techniques and live ammunition are used.