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The 155 mm gun motor carriage M40 was an American self-propelled artillery vehicle built on a widened and lengthened medium tank M4A3 chassis, but with a Continental engine and with HVSS (horizontal volute spring suspension), which was introduced at the end of the Second World War.
The M40 was initially successful due to operational similarities to the familiar M27 and ready availability from the U.S. military; however, in 1995, a USFS gunner was killed by shrapnel after a low-level premature warhead detonation inside an M40 barrel. The accident was attributed to an undiscovered hairline crack in the projectile's base plate.
105mm Howitzer Motor Carriage M7 – self-propelled 105 mm Howitzer Motor Carriage (HMC) based on the M3, M4 and later M4A3 (M7B1) Sherman chassis. 155mm Gun Motor Carriage M12 – self-propelled 155 mm Gun Motor Carriage (GMC). Cargo Carrier M30 – cargo Carrier (an M12 with crew and ammunition space in lieu of the gun).
The specific problem is: Needs ... M39 ? motor carriage; M40 gun motor carriage ... medium, f-t, 8 ft longer barrel, 155 mm; M109G howitzer, S-P, horizontal sliding ...
The M4 high-speed tractor used M5 Stuart tracks, roadwheels, and drive sprocket. However, the suspension was of the HVSS type, first introduced on a light tank T6 project in 1938. One variant was designed to tow the 90 mm anti-aircraft gun, and another was for the 155 mm gun or 8-inch howitzer. [1]
The M43 shared the same chassis as the more widely produced M40 gun motor carriage, which instead mounted a 155 mm gun, and were designed by the Pressed Steel Car Company. A production run of 576 was planned originally, but in the end only 24 were produced and another 24 were converted from M40 hulls. [1]
He says he told the men: "Sir, if you continue to harass and assault the staff, we're going to have problems." It escalated quickly from there. As Bissonnette put it, "They just started chuckin'."
The 155 mm gun M1 was a 155 millimeter caliber field gun developed and used by the United States military. Nicknamed "Long Tom" (an appellation with a long and storied history in U.S. field and naval artillery), it was produced in M1 and M2 variants, later known as the M59.