It´s not that deep :O)
I started out with Yossarian, only to notice that there are a million other people using that name as a nick. Then I added 0815, which in german denotes "the usual" like John Doe in english. At the time I was only vaguely aware of the 80/15 Machine Gun story.
I then stuck with that because both parts of the nick have a WWII connotation, which I like being a WWII buff and having soldiers on both sides of the conflict in my family.
Everybody called me jaybeewhy online :O)
And the Y is also in Yossarian and there are two Ys in my surname. So maybe it is deep and full of meaning :O)