Re: Wife had one night stand and got pregnant while I was deployed to Iraq.
The only thing that you remove those images is time.
I must agree with tg, it was probably much more than a one night stand. She is going to have to come clean and be honest with you, and the truth probably won't come willingly or all at once. She needs to understand that complete transparency is required for reconciliation. Yes, it is going to hurt, but she needs to get it out in the open so it can be dealt with. The problem with lies is that people can never keep them straight and the truth, or pieces of it, will eventually make its way back to you. If she continues with the one night stand, I was drunk, BS then any progress you think you will be making will be for nothing and the damage will end up being 10x what it would be if she was honest from the start(that will be hard for her to believe right now, but its true).
Considering this resulted in a pregnancy, my guess is she has already told the OM. Regardless what that person thinks now, he will more than likely want to know his child in the future, so she can bet this person is going to come back into the picture, assuming he has even left it, which will greatest decrease any chance of her being able to maintain a lie about what happened while you were deployed.