If the Marine Reserves are like the active Navy, and I think they are, here is what will happen. You will be Notified, Counseled, and you must respond to your ADSEP. If you fall under the entitlement to present your case to an Admin Sep board, (the guidelines are in the MILPERSMAN), then you will need to elect to have it. If not, tough luck. That board will decide what is going to happen. Sometimes this happens after MAST or Office Hours. Keep in mind, this is the Navy side, but I think Marines fall under this. The board almost always goes with the CO's recommendation.
Look, think about it this way. Do you think an Airline will want to hire someone who has a problem with showing up to work? I sympathize with your plight, as I want to fly for a living really bad, but I am not going to risk getting kicked out for it. I will wait 6 more years when I retire. When I interviewed at SkyWest (I got out for 3 years and came back in) and got a job as an A&P, my interviewer wanted to see my DD214. In any case, if you do get your ADSEP and even turn it into honorable, which there are procedures to do in the MILPERSMAN, and you are in an interview, then prepare what you are going to say and blame yourself and only yourself and tell the interviewer how you have changed, because the Marines did not tell you to not be at where you were appointed to be. That was your choice. I would try to fix it, if I were you, if you can. Fullfill your obligation-you signed it. I hear this every day at work. ADSEP's are not good for the future.
Tough love
Wittmandriver