The Chosin reservoir battle was an ambush by the Chinese army on the unsuspecting US forces. Yet the Chinese casualties were five times that of the US'. For the past decades, Chinese propaganda machines have boasted their 'victories' in Battle of Triangle Hill(上甘岭)and heroes such as 邱少云, but never mentioned Chosin before.
Now the CCP needs another round of brainwashing of its people. It has to put lipstick on a pig. That's why even Chosin ambush could make the cut.