A MI-24 Hind attack helicopter simulates ground attacks as it flies in the mist of a simulated aerial chemical attack on an air defense site at Dona Ana Range, Fort Bliss, El Paso, Texas, on April 22, 1997. The attacks on the camp are part of Exercise Roving Sands '97. More than 20,000 service members from all branches of the armed forces of the U.S., Canada, Germany, and the Netherlands are participating in Roving Sands '97. The exercise is designed to refine their skills in operations using an integrated air defense network of ground, missile and radar early warning systems combined with tactical fighter and bomber aircraft operating in a simulated high-threat environment. The Russian made helicopter is operated by Optec Threat Support Activity, Biggs Army Airfield, Texas.