North Korean leader Kim Jong-un has visited a munitions factory producing multiple rocket launchers, calling for more production of the weapon system that can be used as a "strategic attack means," state media reported Tuesday. Kim visited a major munitions industry enterprise Sunday to review the production of weapons and combat equipment, the Korean Central News Agency (KCNA) said, without disclosing the location of the factory. Ahead of next year's key party congress, the North's leader has ramped up his military-related inspections, including a visit to the site of building a nuclear-powered submarine and overseeing launches of anti-air missiles and cruise missiles. Noting the multiple rocket launcher system will be the primary strike capability, Kim called for a "revolution in upgrading the artillery weapon system," according to the KCNA. "The weapon system, which will be used in large quantities for concentrated attack in military operations, is a super-powerful weapon system as it can annihilate the enemy through sudden precise strike with high accuracy and devastating power and c