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An M18

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Title: An M18  
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Subject: AN M8, 1-メチルアミノアントラキノン, List of individual weapons of the U.S. Armed Forces, Equipment of the United States Army, Hand grenade
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An M18

Diagram and cross section of the M18 smoke grenade.
Smoke billowing from a green M18.

The M18 Colored Smoke Grenade is a US Army grenade used as a ground-to-ground or ground-to-air signaling device, a target or landing zone marking device, or a screening device for unit maneuvering. The M18 replaced the World War II M16 which did not burn as long as vividly. It is not designated the "AN-M18" but "M18." It can be seen repeatedly in the film Apocalypse Now (1979). It was discovered in Vietnam that the green smoke drove away swarming bees.

Model 18 Colored Smoke Grenade
Color/Markings: Olive drab body with a light gray band and markings, the top painted red, green, yellow, or violet to indicate the smoke color and the color marked on the side. In World War II the M18 had a light gray body with a yellow band and markings and the top in the smoke color.
Body: Sheet steel cylinder with four emission holes at the top and one at the bottom to allow smoke release when the grenade is ignited.
Fuze Assembly: M201A1 Pull-ring Igniter. A "mouse trap" type igniting fuze with a 1.2 to 2.0 second delay. Ignition ignites the filler and expels it from the grenade body.
Filler : 11.5 ounces of a colored smoke mixture. Available in red, green, yellow, or violet.
Weight: 19 ounces.
Safety clip: No.
Range: Can be thrown 35 meters by an average soldier.
Duration: The grenade produces a cloud of colored smoke for 50 to 90 seconds (0.85-1.5 minutes).

Potential hazard

With both the white AN-M8 and M18, there is a danger of starting a fire if it is used in a dry area. Expended smoke grenade canisters remain hot for some time after burning out and should not be picked up bare-handed. New smoke mixtures are under development that are less harmful if the smoke is inhaled for prolong periods. In enclosed spaces the smoke displaces oxygen and can cause respiratory or oxygen deprivation.

See also

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