Stamango: "The air show's first day opened with a aerobatic display by U.S.-made Hughes MD 500 military-use helicopters, the origin of which has raised questions of whether international sanctions against North Korea were violated." So I looked into it: "North Korea In 1985, North Korea circumvented U.S. export controls to indirectly buy eighty-seven U.S. manufactured civilian versions of the Hughes MD 500 before the U.S. government stopped further deliveries. Reports indicate that at least sixty of the helicopters delivered were modified as gunships. Because South Korea licenses and produces the MD 500 for use in its armed forces, the modified helicopters were useful in North Korea's covert or deceptive operations. The aircraft were finally unveiled by the North Koreans and seen by the West during the Victory Parade held on 27 July 2013 in Pyongyang on the 60th anniversary of the end of the Korean War. Images and analysis show that they have been modified to carry Soviet AT-3 Sagger anti-tank wire-guided missiles." 30 year old choppers. These are light choppers that pose little threat except to unsupported ground forces.