He also bears a scar on his left cheek from a bomb disposal mission gone wrong.
Sixty-four years after it ended, the war is still giving up thousands of bombs, mortars and pieces of live ammunition.
Virtually all of it is American, but Jong noted that more than a dozen other countries fought on the US side, and every now and then their bombs will turn up as well.
According to Jong, his bomb squad is one of nine in North Korea, one for each province. His unit alone handled 2,900 leftover explosives including bombs, mortars and live artillery shells last year. He said this year they have already disposed of about 1,200.
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North Korea is just one of many countries still dealing with the explosive legacy of major wars. In Asia alone, Vietnam, Cambodia, Laos and even Japan have huge amounts of unexploded ordnance left to clean up.
The three-year Korean War, which ended in what was supposed to be a temporary armistice on July 27, 1953, was one of the most brutal ever fought.
The tonnage of bombs dropped on the North was about the same as the total dropped by the U.S. Against Japan during World War II. North Korea is probably second only to Cambodia as the most heavily bombed country in history.
By 1952, the bombing was so complete that the Air Force had effectively run out of worthwhile targets.
North Koreans claim 400,000 bombs were dropped on Pyongyang alone, roughly one bomb for every resident at the time, and that only two modern buildings in the capital were left standing.
Twelve to 15 per cent of the North's population was killed in the war.
Charles Armstrong, a historian at Columbia University, said the expansion of saturation bombing in North Korea marked something of a turning point for the United States and was followed by the use of an even heavier version during the Vietnam War.