I have never heard of a situation like you are describing. I'm not sure if you have actually seen this agreement or just been told about it, but I would be highly suspicious. It could be an effort to cover up a poor service characterization. You and her may have some misunderstanding about her responsibilities after cooperating in a military investigation.
In any event, it seems very suspect.
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There is no such thing as an "anonymity agreement" when one gets out of the Army. Somebody is not telling somebody the truth.
I find it hard to be that a military service member can be in fact discharged w/o discharge paperwork. An administrative discharge would not come on any criminal background check unless the service member was separated because of criminal offenses.
Somebody shoveling you a pile of BS.
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