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A shell casing flies out with a trail of smoke as U.S. Army Pfc. Michael Freise fires an M-4 rifle. Credit: DoD photo by Staff Sgt. Suzanne M. Day, U.S. Air Force.
ballistics:
The science that deals with the movement of bullets, shells, and other missiles. [Ballistics is based on a Latin word for an ancient weapon that hurled rocks and large objects.