English: A white phosphorus bomb explodes on a mast top, while the ship in use as a target in Chesapeake Bay, 23 September 1921. An Army Martin twin-engine bomber is flying overhead. U.S. Naval History and Heritage Command Photograph.
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This file is a work of a sailor or employee of the
U.S. Navy, taken or made as part of that person's official duties. As a
work of the
U.S. federal government, it is in the public domain in the United States.