I know very little about how the military works.

Can someone point me toward a source explaining how soldiers holding non-combat jobs in war zones (specifically, women like Private Jessica Lynch, who have jobs on supply teams and such) are paid?

Ideally, I’d like to know both (1) how much they are making compared to soldiers of similar rank in combat roles in the same operational areas and (2) how experience in both non-combat & combat jobs in war zones is considered in promotions.