Appearing before members of Britain’s Parliament on Tuesday, a top British general disputed assertions that his forces are to blame for the security failures that led to last year’s deadly Taliban attack on a coalition airfield in southwestern Afghanistan. Lt. Gen. David Capewell, who oversees the planning for British military operations abroad, told lawmakers that even though the Brits were in charge of security for Camp Bastion at the time of the attack, they are not responsible for the deaths of two Marines gunned down after 15 insurgents breached the base perimeter in September 2012. His testimony before Parliament’s Defence…