I've been thinking of the name Jason and I have read the thoughts of those who have given their take on the name.
So, I want to add one or two of mine.
Maybe the name Jason is for "JA's On." Like John Albert (his initials) is on.
Or, maybe since he's a JAG the III, he meant to say "JA's son." His father's son.
There was a movie about a serial killer, something I heard off (not giving it as fact)... the man killed during the months of (J)uly... (A)ugust... (S)eptember... (O)ctober... and (N)ovember. Maybe it was one of those fictitious TV series? Maybe Bones or the like...
Like someone mentioned, maybe he signed up and used the name to "hide" the fact that he is a RSO, in case someone was checking?
Maybe he likes Jason Borne?