Thank you for the information and your question. Based on my experience, whatever was communicated to your son from the Lt. Col. was either not stated artfully or got lost in translation. What I mean by that is that if he appealed nonjudicial punishment (Article 15
), if he received that prior to being processed for separation, or he attached an appeal/request for retention, it was denied. If his CO and the separation authority wanted to change the outcome of his separation they could. The "it's too late" is not really the issue. From what you say, your son made a false official statement and also was not following orders to PT, after having the scoring issue previously, so his CO could have, if they wanted to, retained him. That was entirely within their discretion.
So, no, unfortunately, there is nothing that an attorney, whether an active-duty judge advocate or a civilian, can do to change the outcome of this issue.
You are correct though that in order to reenlist after receiving a RE code of 3F, your son will have to receive a waiver by the recruiting command should he want to reenlist in the future. Waivers are difficult to get right now because of all of the downsizing in the military, but they do happen from time to time and as the circumstances change, they may be easier to get.
Please let me know if you have a specific follow up question. I would be glad to assist you further if I can.