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.

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From The National War College Military Image Collection archive copy at the Wayback Machine

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