IDF soldiers, participating the Orange Flame Drill, are wearing face masks while acting wounded in Shprinzak Medical Center, Tel Aviv on January 13, 2010. A two-day exercise, code named "OrangeFlame", simulating a response to a biological warfare attack began Wednesday in the Dan region. The exercise, which is the largest of its kind in Israel's history, will be carried out in Tel Aviv, Ramat Gan and Holon, seeks to evaluate the ability of the Home Front, medical services, rescue teams and municipal authorities to respond to conditions created by a biological catastrophe caused either by terrorists or by some kind of accident. Photo by Gili Yaari / Flash 90