British Army soldiers of the 1st Battalion "Vikings", Royal Anglian Regiment, who recently returned from a combat tour in Afghanistan, march with bayonets fixed through the London suburb of Barking June 15, 2010. REUTERS/Sergeant Dan Harmer/MoD/Crown Copyright/handout (BRITAIN - Tags: CIVIL UNREST POLITICS MILITARY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS