Hi James:
These are still on issue in the CF and are used as fire sirens in large tented camps.
They have many other uses... I had one on my ammo truck as a young Gunner and had to crank it as I drove through the built up area of Camp Dundurn to warn people I was loaded with live ammo... of course it never entered any one's mind that my hands were already full driving a Deuce with 5 tons of ammo on board and no power steering!
Cheers! Mike