The flag of North Korea, as shown in the photo ... up of a white rectangular background which has a red/blue yin-yang symbol in the middle, which is surrounded by four black trigrams.

The sub was adorned with blue and white bunting, and the bow was wrapped in the colors of the North Korean flag. The submarine ... of the U.S. Navy, as a “symbol of aggression” for decades.

North Korea also flies its flag on a 525-foot flagpole across from the Demilitarized Zone — a symbol of the still-simmering tensions between the two countries.