Well, she may have enough time to pull him out. Under the law, the Army is required to have custodial parental consent
to enlist a minor. But really this will depend on the Army. If they want they can give him a uncharacterized discharge
which would allow him to re-enter at 18. Or they can wait and let mom file suit in federal court to try and void the contract. If she is the custodial parent, it is likely this would happen...but its not certain. And if the Army does not do this for her, it will force action (and expense) on her part.
When he turns 18 he can stay in without hitch.
Please let me know if you have further questions; if so I will do my best to answer them. If not please hit the accept button, its the only way I get credit for my work.
Terms and Conditions: By your continuing in this conversation with me, or by your clicking “Accept”, you are expressly agreeing to all of the following: (1) our communication is for entertainment purposes only; (2) you are not consulting me in my professional capacity as an attorney; (3) you do not seek to establish an attorney-client relationship with me, nor do I with you; (4) you will not rely on anything I say and you will obtain appropriate legal counsel via a traditional office consultation with an attorney licensed to practice in the jurisdiction where your legal issue arises; (5) by communicating with me in this public forum you are irrevocably waiving any right to privacy, confidentiality and attorney-client privilege concerning the matters discussed. You further separately declare that any payment made by you is not consideration for this contract, nor offered for any services rendered by me on your behalf. If you do not agree with these terms and conditions, then you must advise me immediately.