The organizers of one of the biggest draws at the Edinburgh festival, the military tattoo, are hoping to expand worldwide, eventually holding the event across Asia, the Middle East and North and South America. [...] The tattoo, which began in 1950 and is a charity, has become a showcase for British forces and their counterparts from around the world and been a sellout for the last two decades, attracting audiences of about 220,000 at the event and 100 million on television.