The United States Army Ceremonial Drill Team performing at the Edinburgh Military Tatoo
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I had the pleasure of seeing them at The Nova Scotia International Tattoo in Halifax in 1997, it's now called The Royal Nova Scotia International Tattoo. I worked as part of the stage crew and got to see a lot of interesting stuff from back stage. Apparently they made a documentary about it. I wouldn't mind finding a copy of it some where.
The Nova Scotia International Tattoo 1997