In 1948, Oppenheimer chaired the Department of Defense's Long-Range Objectives Panel, a body created by AEC liaison Donald F. Carpenter. It looked at the military utility of nuclear weapons, including how they might be delivered. After a year's worth of study, in spring 1952, Oppenheimer wrote the draft report of Project GABRIEL, which examined the dangers of nuclear fallout. Oppenheimer was also a member of the Science Advisory Committee of the Office of Defense Mobilization.