(no subject)

I'm not sure if this is a stupid question, but is there a sort of generally-accepted pseudo-canon for Nathan's past? Like when he joined the navy, when he started work, when he met Heidi, etc. Do we even know how long he's been with Heidi? Gah.

I'm sure I'm just going to be told that people just make it up, haha, and I know I probably should come up with my own idea of these things and just stick with it, but it's the kind of thing I always get nervous about when writing past-fic. I know there is no specific canon, but if anyone has their own really fixed idea of when things happened it would really help me out. :( I don't know why, I just really struggle with that kind of thing.