Possible Clues:

• Park ranger's uniform color
• Habit Tommy got into
• Military fabric/colour
• Dullish brown 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
• Gives Sikh a kitbag holding military-type clothing
• Sounds as if one can't start the car without one for the army