A tattoo is a military performance of music or display of armed forces in general. The term comes from the early 17th century Dutch phrase doe den tap toe ("turn off the tap"), a signal sounded by drummers or trumpeters to instruct innkeepers near military garrisons to stop serving beer and for soldiers to return to their barracks.
The tattoo was originally a form of military music, but the practice has evolved into more elaborate shows involving theatrics and musical performances. It is also used to designate military exhibitions such as the Royal International Air Tattoo.
The term dates from around 1600 during the Thirty Years' War in the Low Countries (Belgium and the Netherlands). The Dutch fortresses were garrisoned with mercenary troops that were under federal command since 1594. The Dutch States Army had become a federal army, consisting mostly of Scottish, English, German and Swiss mercenaries, but commanded by a Dutch officer corps. Drummers from the garrison were sent out into the towns at 21:30 hrs (9:30PM) each evening to inform the soldiers that it was time to return to barracks. The process was known as doe den tap toe (Dutch for "turn off the tap"), an instruction to innkeepers to stop serving beer and send the soldiers home for the night. The drummers continued to play until the curfew at 22:00 hrs (10:00PM). Tattoo, earlier tap-too and taptoo, are alterations of the Dutch words tap toe which have the same meaning.Taptoo was the earlier used alteration of the phrase and was used in George Washington's papers in which he said:"In future the Reveille will beat at day-break; the troop at 8 in the morning; the retreat at sunset and taptoo at nine o'Clock in the evening."