Yep, definitely not scuba. They're CO2 for a soda fountain. Times have changed and there's not much call for them anymore. They aren't too hard to break down for scrap. Just make sure the tank is empty. Pull the snap ring that holds the collar in place and remove that. Strap the tank down to something solid with a ratchet strap and use a 24" pipe wrench -or- a large adjustable to remove the valve. You can cut the brass valve off with a sawzall too but it's a bit more work.
Don't know how the aluminum would be, but i've seen the steel O2 tanks turned upside down and hung on a tripod. They make a really kool bell.
The other thing is that they would be great as storage tanks for an air compressor. A bit heavy, but they would never rust out. Once you pull the valve it's just a standard pipe thread going into the tank. Looks like either 1" or 1 & 1/4" NPT. You could just use standard pipe fittings & valves that you can get at the hardware store to plumb them up.
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