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US Marines 100520-M-9232S-012 M18 green smoke grenade crop

A green colored AN M18 being deployed.

M18red

An AN M18 Smoke canister.

The AN M18 Colored Smoke Grenade, is a US Military grenade used as a ground-to-ground or ground-to-air signaling device, a target or landing zone marker, or a screening device for unit movement.