When is it legal to fly the jolly roger pirate flag?
“In World War II it became common practice for the submarines of the Royal Navy and Royal Australian Navy to fly the Jolly Roger on completion of a successful combat mission where some action had taken place, but as an indicator of bravado and stealth rather than of lawlessness. The Jolly Roger is now the emblem of the Royal Navy Submarine Service (UK).” a quote from, http://en.wikipedia.org/wiki/Jolly_Roger A great link but it doesn’t specifically answer your question. It does contain references to many recent instances of UK naval ships flying the Jolly Roger following missions during which they fired their arms.