A war which lasted 20 years, cost many lives and which the USA lost.
Vietnam is classified as the NIC because the Americans and the Australians helped them Industrialise by giving them money.
Vietnam is referred to as the Socialist Republic of Vietnam. Vietnam is still considered a Socialist country, but since the war, they've adopted many Capitalistic practices.
National security matters are authorized to be classified.
the names of Americans who died in the war of who remained classified as missing in action
The SR-71 Blackbird's "actual" speed is classified, and was retired after the Vietnam War (two SR-71's were lost in the Vietnam War to operational causes).
Copper would never be classified as a metalloid it is a metal.
This would be classified as formal.
In 1969 my orders indicated that Thailand was classified as a "Limited Combat Zone"
vietnam
Man's best friend was in Vietnam; over 5,000 of them. 3,747 of whom were documented. Approximately 73 US servicemen assigned as dog handlers and 43 war dogs were killed in Vietnam. US military K9s were officially classified as military working dogs in Vietnam.
The fact that someone was awarded a Purple Heart is not classified information. The citation as to when and how the were wounded might remain classified for a period of time. Anything from WW 2, Korea and Vietnam is outside of the classification range.
My guess would be that they would be classified as mammals, given their humanoid appearance.