155 mm caliber
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"155 mm" is a very widely used calibre for artillery guns and their corresponding artillery shells.
155-mm De Bange canon Mle 1877
M107, M795, M483A1 155 mm projectiles
M198 howitzer
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The M198 is a medium-sized, towed 155 mm artillery piece, developed for service with the United States Army and Marine Corps. It was commissioned to be a replacement for the World War II-era M114 155
155 mm caliber
…United Kingdom / United States M777 United States M109 howitzer M114 howitzer M198 howitzer Compatible with NATO projectiles…
U.S. Marines in the Persian Gulf War 001
Royal Thai Army firing M198 howitzer
Australian M198s firing during an exercise