I am wondering just what a militarty tatoo is though?
The word 'tattoo' comes from the closing time cry in the inns of the Low Countries during the 17th and 18th centuries -
Doe den tap toe ('turn off the taps'). Innkeepers used the term to refer to the drummer whose marching warned imbibing soldiers to return to their barracks. The saying was shortened to “tap toe” and anglicized to “tattoo.”
Later the signal sounded on a drum or bugle to summon soldiers or sailors to their quarters at night was generically called 'Tattoo'.
Taken from the Edinburgh Military Tattoo and other websites.