Recently, it has become customary to invite units from France's close allies to participate in the parade. For instance, in 2004, to mark the centenary of the Entente Cordiale, British troops (the band of the Royal Marines, the Household Cavalry Mounted Regiment, Grenadier Guards and King's Troop, Royal Horse Artillery) led the Bastille Day parade in Paris, with the Red Arrows flying overhead. While British troops had participated in the Bastille Day parades of 14 July 1919 and 1939 (see below), this was the first occasion that invited foreign troops had actually led the parade. In 2007, the parade opened with detachments from all member states of the European Union, flying the European flag. The European anthem was played.