Looking for episode-related backstory.

[gaffsie.livejournal.com]

McKAY: Ever seen a twenty kiloton nuclear explosion?

SHEPPARD: I have. (Everyone looks at him) Not up close.
(s01e03 Hide and Seek)

So, has anyone ever written about in what context John Sheppard saw a nuclear explosion? Even if it's just a throw-away mention I'm interested.

Thanks!