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 mm howitzer. It was designed and prototyped at the Rock Island Arsenal in 1969 with firing tests beginning in 1970 and went into full production there in 1978. It entered service in 1979 and since then 1,600 units have been produced.
M198 howitzer
Royal Thai Army firing M198 howitzer
Australian M198s firing during an exercise
155 mm caliber
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155 mm is a NATO-standard artillery shell caliber that is used in many field guns, howitzers, and gun-howitzers. It is defined in AOP-29 part 1 with reference to STANAG 4425.
M107, M795, M483A1 155 mm projectiles
M107 projectile 155 mm projectile being loaded into an M777 howitzer