Some pictures show leader Kim Jong-un with a big smile on his face when the forces, clad in black sunglasses and their faces painted in black camouflage, appear.
"Some people in North Korea are making inquiries about how they could sell American soldiers' identification tags", Kim Dong-nam, head of the International Network for a Free North Korea, told the U.S, -based media outlet. Kim said it's important to understand the history of both countries.
The U.S. and North Korean teams had jointly recovered the remains of more than 200 U.S. servicemen in Unsan, North Pyongan Province, and near the Chosin Reservoir, South Hamgyong Province, from 1996 through 2005. The team is expected to fly out of Seoul, South Korea on Friday.
The 2008 presidential nominee added that he's known for his straight talk, that the North Korean leader, "is insane and that's what makes him risky so why not call people what they are". Analysts argue the North Korean threat has remained steady since it first tested a nuclear weapon in 2006.
North Korea rolls out missiles, other weaponry at parade
The communist country has been regularly conducting nuclear and missile tests defying United Nations' resolutions and sanctions. The secretive state also showed off a submarine-launched missile that it successfully fired previous year .
A military parade in Pyongyang on Saturday marks the 105th birthday of North Korea founder Kim Il-sung in this photo from the official [North] Korean Central News Agency. Vice President Mike Pence visited South Korea this week to ensure the country that it has the United States' support.
McCain is also not a fan of the North Korean leader.
In an interview with the BBC on Monday, North Korea's Vice Foreign Minister Han Song-Ryol said Pyongyang would continue to test missiles on a "weekly, monthly and yearly basis".
US military officials indicated earlier this month that the aircraft carrier USS Carl Vinson and its support group would sail toward the Korean Peninsula in response to rising tensions and reports of a looming North Korea missile test. The ships are now operating in the Indian Ocean, conducting exercises with Australian naval forces, according to Defense News.