Since 1942, the M18 has been the standard colored smoke grenade for the US military. Common uses include signaling and targeting in addition to providing cover for troop movement.
Basic Information:
- Made out of a cylinder of sheet steel with 4 holes in the top and 1 in the bottom to emit smoke.
- Colors: green, red, yellow, violet.
- Filled with 11.5 ounces of colored smoke mixture.
- Weight: 18 ounces.
- Produces smoke for 90 seconds.
reference: http://www.fas.org/man/dod-101/sys/land/m18.htm | 
