South Korean tanks and howitzers have staged combined live-fire drills in Qatar, officials said Monday, marking the Army's first overseas exercise with the armored vehicles.Earlier this month, a contingent of some 100 South Korean soldiers, four K2 tanks and four K9 self-propelled howitzers arrived in Qatar aboard a Navy landing ship to take part in the drills at the Al Qalayel training center.It marked the first time for the Army's tanks and self-propelled howitzers to join overseas drills.At the desert training ground, South Korean troops held combined combat drills with Qatar's Leopard 2A7 tanks and Panzerhaubitze 2000 self-propelled howitzers to bolster their live-fire capabilities, according to the Army.The Army said it will conduct additional live-fire and maneuver drills with Qatari troops over the exercise period set to end Sunday.The combined exercise takes place after the two countries signed a memorandum of understanding in February to strengthen cooperation in the defense sector.Sour ce: Yonhap News Agency