RAWALPINDI – Chief of Army Staff General Raheel Sharif discussed overall regional security situation with greater reference to Afghanistan in a meeting with US special representative for Afghanistan and Pakistan Richard G Olson. Ambassador Olson called on the army chief at the General Headquarters in Rawalpindi on Saturday where matters related to regional security came under discussion, the Inter-Services Public Relations (ISPR) said in a statement. The visiting ambassador has appreciated the efforts of Pakistan in fighting against terrorism.