What an unusual piece of graffiti. Wet cement, water still pooled in surface irregularities, the foundation of what will be a wall between the street and a generously-proportioned front garden of a large house in a genteel suburb of north London.
Who, I wonder, and why. Wikipedia tells me the second phase of the offensive began on 5 May 1968 so it’s nearly exactly 40 years ago. As well as being long ago it was also far away. There is no Vietnamese community in the area that I am aware of.
Perhaps there is some modern British signification attached to the phrase of which I am ignorant. Maybe it is a reference to recent political events in the USA.
Or perhaps I should just stop worrying about the words and take it at face value.