When a service member deploys to the desert and has sexual relations with an unattractive female. Being in the desert for such long periods of time forces the service member to have sexual relations with a female he normally wouldnt consider state-side. A girl who is usually a 2 or 3 will be a 6 or 7 after months of being in the desert.
Soldier 1: Dude, did you hear Sgt John is banging Sgt Jane?
Soldier 2: What?! Shes hiddeous!
Soldier 1: He must have desert goggles.
Soldier 2: Well, He has been deployed for a while.