has a completely different meaning in British vs American English. In US parlance – one passes out from too much drink. Here in the UK, apparently one passes out from an organization. That is, graduates and moves on to what comes next.
Today was the 162nd Passing Out Parade at the Royal Military Academy, Sandhurst. I present to you a number of photos, they are sequential (or at least you can follow by numbers) from first formation to the Seniors “Passing Out.” And no, the Queen was not present.