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M54A1 (HE-T-SD)
The M54A1 was a fixed, 37 mm, nose-fuzed, high explosive tracer self-destruct (HE-T-SD) cannon round, or simply HE in US terminology of the time. The M54A1 HE-T-SD round was used by 37 mm M1 series of anti-aircraft guns and the M9 (AN-M9) aircraft cannon. The M54A1 is a slightly modified version of the earlier M54 HE-T-SD round, differing only in its tracer ignition and tracer main charges. Other known rounds in the family are: M55A1 tar...
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