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M57 (81 mm Smoke Mortar Bomb)
The M57 was a World War 2 (WW2)-era developed US, 81 mm, bursting white phosphorus (WP) smoke mortar bomb round. The M57 is fitted with the M52 series of point-detonating superquick (PDSQ) fuzes, with the data in the specifications when the bomb is fitted with the all aluminium M52 model. Later M57 may be fitted with the M77 time and superquick (TSQ) fuze. The M57 uses the same bomb body and fin assembly as the M53 'FS' filled smoke and...
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