Last year, the documentary maker Matthew Heineman was embedded with a special forces unit in Afghanistan.

He expected to spend months filming them on their missions in that country. Instead, after Joe Biden announced the US was finally withdrawing, the troops had ten days to pull out, and Matthew needed to decide whether he had a film.

The end result, Retrograde, documents the withdrawal, the struggles of the Afghan army in the aftermath, and the final shocking moments of escape at the airport of Kabul.