Thousands of riders participating in the annual 'Rolling Thunder' motorcycle rally descended upon Washington DC, Sunday. «Fantastic to have 400,000 GREAT MEN & WOMEN of Rolling Thunder in D.C. showing their patriotism. They love our Country, they love our Flag, they stand for our National Anthem! Thanks to Executive Director Artie Muller,» tweeted the US president Donald Trump on this event... Еще. The tradition began in 1988 and is held every Memorial Day weekend. It is billed as a tribute to US military veterans, prisoners of war and Americans missing or killed in action.