I found this image on Wiki. You can see the details a little better maybe.
"On October 26, 1967, during the Vietnam War, US Navy aviator John McCain was shot down by an anti-aircraft missile on a mission against a Hanoi power plant and parachuted wounded into Trúc Bạch Lake, nearly drowning. He was dragged out of the water and beaten by city residents angry at having seen the area laid to waste by previous U.S. attacks. He was later taken away as a prisoner of war. A monument celebrating the downing of "Tchn Sney Ma Can" was erected at the western shore on Thanh Niên Road; McCain saw it on his first journey back to Vietnam in 1985."
Bob's photo is considerable older than mine. His was taken when the discoloration and peeling on the text of the monument had not begun. In my photo, the skyline of the city is more developed and the edge of the water has a railing but the tiles are breaking up down by the railing.
Typical rotten commie construction habits. They never build for permanence, it seems.