>Why are the remains of Americans who died in Korea wrapped in flags of the United Nations? Is that who killed them? Is that what I am seeing?
My first thought as well. However, it was actually a United Nation's operation, many military's were involved. Hopefully they will repatriate their lost as well.
"Twenty-one countries of the United Nations eventually contributed to the UN force, with the United States providing around 90% of the military personnel.[48]"
https://en.wikipedia.org/wiki/Korean_War