Americans have long believed Audie Murphy was the 'most decorated WWII combat soldier' see
www.audiemurphy.com
Countries vary hugely in customs concerning decorations. E.g. the USA awarded a decoration for being wounded (Purple Heart) in WWII while Britain made no award for wounds. (In WW1 British rankers were awarded a 'wound stripe' worn on the cuff and officers nothing.) The point is that it makes international comparisons difficult unless you can 'normalize' national differences.