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M821A3 (HE Mortar Bomb)
The M821A3 is a US, high fragmentation steel (HF-1)-bodied, 81 mm high explosive fragmentation (HE-frag) mortar round, which is known as a cartridge in US terminology. The M821A3 is based on the M821A2, but primarily differs in that its main body is filled with the insensitive munitions (IM) high explosive IMX-104 and not Composition B. When under development as the M821A2E1, what would become the M821A3 was to originally use other IM explosiv...
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