HUET currency is a requirement these days for fire ops in Australia, so every couple of years it's back for another go. Includes lifejacket & dinghy drills, and rebreathers for those who fly with them. Did mine last month, no idea how many times that would be since the first in 1969! Most offshore, ambulance and police do them regularly as well.
There's a certain evil satisfaction in being tasked first out with the other to follow you, taking a deep breath and waiting.....waiting.....to see when he'll crack
