Possible Clues:

• Drab military colour
• Brownish-yellow
• Park ranger's uniform color
• Military fabric/colour
• By the sound of it you need this to get the car open just a shade
• Shade giving cover for the troops
• Leaders in Kabul, Herat and Kandahar imported military material
• This, we hear, could give access to vehicles of uniform colour
• Military clothing
• Dull brown