could defeat up to of vertical armor at . T44 HVAP: Modified M304(T30E16) for use out of the T15. Muzzle velocity of . Maximum penetration of of vertical armor at 30 ft. T50 APCBC: An M82 projectile with increased nose hardness and overall better design. Same muzzle velocity 3,200 ft/s, but increased penetration, equal to the KwK43. against vertical armor at point-blank range. Two versions of the T15 were made: the T15E1 with single-piece ammunition and the T15E2 with two-piece ammunition. By mid-March 1945, a T26E1 pilot was equipped with the 90 mm T15E1 and was sent to Europe in a ''trial by combat''. It was given to the 3rd Armor Division where it was enhanced with additional armor plates. Its gun was fired in anger on only one occasion, on April 4, 1945, where it engaged and destroyed a German armored vehicle, probably a Tiger I or Panther, at a range of during the fighting along the Weser River. According to the memoirs of John P. Irwin, it knocked out a King Tiger in Dessau as well as a Panzer IV and a Panther. Near the end of World War II, more experimental versions of the 90 mm gun were tested including the higher-velocity T18 and T19 main guns. The T19 was a T18 modified in an attempt to reduce barrel wear. Other versions included the T21, which was intended for wheeled vehicles, and the T22, which used the breech from the standard 105 mm M2 howitzer. The T21 and T22 were designed to use larger powder charges. None of these versions entered service. In the post-World War II era, development of the T15 continued redesignated as the T54, which used a slightly shorter and fatter propellent casing than that of the T15E1. The T54 served as the main gun on the M26E1 Pershing. Further developments In 1948 an improved version of the M3A1, designated as the T119, was designed to be used on the T42 (and later M47 Patton) and had a higher muzzle velocity using new ammunition loaded to produce higher chamber pressures. The new ammunition had a slightly longer shoulder to prevent accidental chambering in the older M3 variants. The T119 was backwards compatible with the ammunition used on the M3A1. Upon standardization of the M47 in 1951, the T119 was redesignated as the 90 mm gun M36. The lightweight variant of the T119, designated as