There was a 4Chan post of a guy who said he was an extra on this set. He said he and others had to practice running backward out of the back of a helicopter.
The set reminds me of what Kubrick did in the finale of Full Metal Jacket.
The disused Beckton Gas Works, a few miles from central London, were filmed to represent Huế after attacks. Kubrick had buildings blown up, and the film's art director used a wrecking ball to knock specific holes in certain buildings over the course of two months. https://en.wikipedia.org/wiki/Full_Metal_Jacket