Good description of the decocking feature on most DA/SA pistols, like the M11. BUT I'd like to address the qualification "not unheard of in the following.
This is, of course, condition two. I don't know what condition aircrew are required to carried their pistol in, but there is nothing "unheard of" about carrying a DA/SA or a striker fired (Glock) with one in the tube, hammer down, even without a safety. That is the way the Sig P228/229/M11 was designed to be carried. No serious pistolero would ever carried a modern semi auto chamber empty hammer down. Not a LE agency I have heard of does that. Navy, dunno. They are not serious pistol people ( leadership).
And what is the big deal about no safety? No one bitches about revolvers not having safeties.