You missed my point with the MC-4 comment. Even the heaviest jacked swole sick gains SEAL or PJ carrying everything he can possibly hang off his harness plus a set of PVS-31's just for fun, is still jumping a wing loading less than some, if not most, civilian skydivers are doing on a regular basis. It's not the weight rating, it's the wing loading ratio. This equates to rebreather divers running 8, 10 hour runtimes with depths at 100+ meters. Again, civilians are SAFELY, REPEATEDLY going far beyond what the military considers "safe" parameters for everything. But of course there will always be the outliers, the freak accident, the Brett Shadle or the Tom Pritchard, neither are immune.
You act like the military has a monopoly on risk mitigation, and it's just not true. The fact that there are rebreathers that CAN be dived to much greater extremes, without the need for all of those dive support assets you mentioned, and do on a regular basis, is a perfect example of the civilian world seeing a way to mitigate risk in the hardware, procedure, and implementation, doing it. In the end, going far beyond anything the military will ever do with the technology. There are some things the civilian world sucks at, or doesn't have the resources to easily do, things like easy IWR, so it gets fixed on the front end as much as possible. Hell, watch the video of Leon Scamahorn (the inventor of the Megalodon and former Special Forces) destroy his rebreather at 60m and finish the dive. That's about as worst case scenario as you can get.
At the end of the day, if you are unable to be the risk manager required to dive a rebreather, at a time when they're as safe as they've ever been, with best practices in place, and as bombproof hardware as you can get, then you shouldn't dive a rebreather. It's as simple as that. Doesn't make you any smarter or dumber than anybody else, doesn't mean you're better or worse than anybody else, all it does is mean that you don't have the mindset or ability to dive a rebreather. When it comes to today's rebreathers, it's 100% the indian not the arrow.
Found it:
I keep posting Meg stuff because it's the info that's out there, but JJ's, Revo's, Hammerheads, etc. are all capable of similar, and no matter what, bailout os always an option.