South Korean President Moon Jae-in and North Korean leader Kim Jong Un are scheduled to meet on April 27.
The soldiers' identities remain unknown.
North Korea claimed millions visited the captured USS Pueblo, which lies on the Pothong River at the Victorious Fatherland Liberation War Museum in Pyongyang.
After the world's deadliest conflict, a future secretary of state decided to split North and South Korea based on a map he found in a magazine.
North Korea has lashed out at U.S. regional allies South Korea and Japan for acting on Washington's behalf and undermining Kim Jong Un's nuclear ambitions.
One family is suing the U.S. government over its refusal to hand over files on a missing Korean War veteran who may have been taken to Russia.
By the time the war ended, nearly 1.8 million Americans fought in the conflict, nearly 37,000 soldiers died and more than 7,800 remain unaccounted for to this day.
The colonel worked for the North Korean military's General Reconnaissance Bureau.
North and South Koreans will spend three days together in a North Korean resort during a rare reunification event.
The isolated country marked the 62nd anniversary of the signing of the Korean War armistice with anti-American rhetoric.