Back2Fronts is an extensive mod that will overhaul your Call of Duty 2 game to a next level. This mod brings more variety, intensity, realism and battle-like experience. Try new weapons, fight new enemies, fulfil new missions and explore new options. Mod is SP and MP friendly (although primary part is SP).
B2F features colored smoke grenades - namely the American M18 series of smoke grenades in 3 color versions - green, red and yellow. They are used by American AI. Player can select them in weapon select menu for American and British campaign.
M18 smokes are used also by American AI.
Player can select them in weapon select menu for American and British campaign.
Weapon select menu? This is going to be awesome.
Was there a purpose to the colours?
yes, in real life they were used for signaling.