Some videos of previous events (no helicopters though): * https://www.youtube.com/watch?v=xAS9j1BWGiE https://www.youtube.com/watch?v=xAS9j1BWGiE * https://ww

Some videos of previous events (no helicopters though): * https://www.youtube.com/watch?v=xAS9j1BWGiE https://www.youtube.com/watch?v=xAS9j1BWGiE * https://www.youtube.com/watch?v=ThRYOVxUTJg https://www.youtube.com/watch?v=ThRYOVxUTJg Seems that the ceremony occurs a couple of times per year, and in recent years allied navy ships also partake in it as some friendly pomp: * https://en.wikipedia.org/wiki/Constable_of_the_Tower#Constable's_dues https://en.wikipedia.org/wiki/Constable_of_the_Tower#Constab...