Soldier Firing the M224 60mm Mortar. This picture was produced by the federal government of the United States of America and is therefore not subject to copyright restrictions.
From The National War College Military Image Collection
specifically http://www.ndu.edu/nwc/nwcCLIPART/US_ARMY/Equipment/Weapons/Mortars/eM224Mortar60mm1.jpg which is listed on http://www.ndu.edu/nwc/nwcCLIPART/US_ARMY/Equipment/Weapons/Mortars/army-mortars.htm
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