Hue was once the capital of Vietnam and now the old citadel and its buildings have protected status. Although the buildings look about a thousand years old they are in fact only about 150 years old, not very old by our standards !!
Nearby was a war museum dedicated to the ‘American war’ as they call it. These vehicles were outside supposedly captured by the Vietnam army all from the same airstrip, i think they were probably all left behind when the American air force left.