Black paint or ‘Boot-Topping’?
When it comes to military personnel, boot paint and boot-topping is virtually the same. Actually boot-topping is the black coating which is lathered between the deck and the waterline. The consistency is also thick and liquidy and is made of lime or sulfur. Civilians would never even notice the difference between black paint and boot-topping, although an expert military eye can detect it from a mile away.
Quiet In Line
When military personnel stand in line, they’re quiet and don’t make a ruckus. It stems from basic training when they stand in lines in controlled silence before entering the mess hall or waiting for orders. They do the same thing in civilian life waiting for a bus, or waiting for the ATM.