M243 smoke grenade launcher
The M243 smoke grenade launcher uses rounds filled with red phosphorus. Upon activation, a dense cloud of white smoke is created from ground level up to a minimum height of  and between  from the vehicle in 2 to 6 seconds. The cloud lasts 1 to 3 minutes depending on wind speed and other weather conditions. See also
Ground Mobility Vehicle – (US)SOCOM program - American Special Operations Humvees that can install M243s. Sources
M243 (NSN 1040-01-059-0560), M257 (NSN 1040-01-070-1213), M259 (NSN 1040-01-107-7501) Smoke Grenade Launchers

Grenade launchers of the United States