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If I understand correctly here, the recruiter suggested leaving something out of the application. Unfortunately, this is all too common, but unfortunately when it happens, the recruiter is rarely punished and the soldier is always punished.
If he were to come clean now, it would be better than if it is found out later, when he has begun to rely on a long term career. Also, the longer that he stays in, the more harshly the military tends to deal with the fraudulent enlistment issue.
Right now, he'd likely only be administratively separated and not be allowed to join. However, if it is later, it could be a court martial with a criminal conviction.
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