Interview with Armed Forces Minister James Heappey on the airlift from Kabul

The video discusses the unexpected rapid collapse of the Afghan government and the Taliban's swift takeover. It outlines the pre-existing plans for the drawdown of British troops, known as OP Catalo, and the evacuation of personnel, called OP pitting. Despite these plans, the speed of events caught everyone off guard.

What does OP Pitting refer to?

How did the events unfold compared to expectations?