Remaining stockpiles of the HD version are in the process of being destroyed in accordance with the 1997 Chemical Weapons Convention. The HD version has not been produced since the 1960s and was never used in combat. īoth versions are now considered obsolete, with the WP version seeing updated versions in later incarnations of the shell. The WP versions were gray with a single, horizontal, yellow band, as is standard for military smoke munitions. To distinguish between the two, the HD versions were gray marked with two, horizontal, green bands, like most other chemical artillery shells. The original version of the shell came in two variations, one filled with mustard (HD) (Projectile, Gas, Persistent, HD, 155mm Howitzer, M110) and one filled with white phosphorus (WP) (Projectile, Smoke, WP, 155mm Gun, M110). Both versions were designed for employment by the M114 Howitzer and the M44 Self-Propelled Howitzer for use as terrain denial (in the case of the mustard-filled versions), target-marking, and obscuration (in the case of the white phosphorus versions. As early as the 1960s, a white phosphorus version was created under the same designation with 14.6 pounds (6.6 kg) of white phosphorus filler. The original shell typically contained 9.7 pounds (4.4 kg) of Sulfur mustard (H) or distilled sulfur mustard (HD), which would fill the hollow space in the shell. Officially designated Projectile, 155mm howitzer, M110, the original round was a 26.8-inch (68.1 cm), steel shell with a rotating band near its base and a burster rod down its center. The white phosphorus variants of the shell also have a secondary, incendiary effect. The design was later repurposed as a white phosphorus smoke round for marking, signaling, and screening purposes. The M110 was originally designed as a chemical artillery round to deliver blister agents via howitzer as a replacement for the World War I-era 75mm chemical projectiles. The M110 155mm Projectile is an artillery shell used by the U.S.
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