A note about somthing we're all guilty of. We tend to paint Jerry Cans alike and also exactly like the vehicle they are attached to. Infact these cans were used, and reused, and reused, and reused. Some looked new, some looked a little beat up, some looked like hell, some looked faded and some looked rusted. Also they would get repainted in field depots and the colors there would vary a lot.
Just my two cents.