Phasmon
It was dangerous to swim where I was from, but I learned, later - well enough that I was able to modify the dive suits and train my troops for water assaults. The equipment here isn't as streamlined, or as efficient, but it's not much different.
The way it works, as far as I'm concerned, is that if we as a unit find ourselves in a survival situation, we keep you safe and you keep us alive. We don't all have the same skill set, but we have complementary skill sets, and so we need to support and defend as much as we can. But, in the event that we can't, it is good that we all have those secondary skills to fall back on in desperate times as well.