Can someone be discharged from AD under Ch. 16-2 for the NG OCS program?

Not all state OCS programs are the same. Find out more from that specific state. What state are you looking at? Some have an in-house traditional OCS programs that the state is proud of and will not let most people attend the accelerated program. I was a SSG with over 12 years when I went into the program and they did not initially approve the accelerated program for me. Some states only use the accelerated program and do not have a traditional 18 month drill/AT program. Also, there are multiple accelerated programs. South Dakota, Alabama, Washington State, and one or two more. They have the same curriculum, but have some very unique differences. OCS starts at specific times. If you join months prior to class start date, you will be a phase 0 Candidate with no home forcing the TACs to find stuff for you to do until the actual start date. Take all that into consideration.

Additionally, while you are attending OCS, most Candidates are E5, even non-prior service, until they complete phase 1 and then E6 until the commission date. I understand you are already E6, so you will keep your grade throughout. This said, I would assume you need to be transitioned to that state prior to starting OCS. If, for some reason, you don't make it, you will now have a contract with that state as enlisted. I'm sure that if you get big Army to buy off on the move, that state would have to pick up at least the remainder of your current contract if you do not commission.

A lot to think about and you have more research to do, but it can all be done. I hope you are able to figure it all out.

MAJ (Join to see) - Army National Guard Candidates are paid at E-6, unless that has changed very recently. Active Duty Candidates are paid as E-5's. The big question is will the Army release him to attend a Reserve Component OCS and I've never heard of it being done. But that's a decision way above my former pay grade.

All Officer Candidates in my state were paid at E5 until Phase 1. Some states do not have a traditional program, so their first day as an Officer Candidate is shipping to an accelerated program. This means they are paid at E6 from day one. Most states that have a traditional drill/annual training program have a Phase Zero and pay their Officer Candidates at E5 until they ship. I don't know why. Phase Zero for us was 3-4 months long depending on when and where you were sent for Phase 1. Phase Zero was a lot of "PT", ruck marches, inspections, and anything else the TACs decided to throw at us to make sure we really wanted to commission.

As I mentioned in a comment to a post below, I would say just start the paperwork with the state you want to join and everything will likely get sorted. The right people will get the right answers.

MAJ (Join to see) - I'm familiar with the Ohio and Kentucky National Guard programs, no Phase Zero in either one that I am aware. Phase One is the first AT, Phase Two the 12 to 14 months of Drill Weekends and then the final AT and a Commission. Candidates are paid as E-6 as soon as they start Phase One.
Apparently Phase 0 is an unofficial phase that some states use to cull the herd. OCS in any form sucks, so adding something to an already miserable program is at least redundant

I would generally think that, but even the state OCS program leads to a commission. I would imagine most of this would have to deal with how the separation authority views it.

But were you commissioned through Federal OCS or National guard OCS? I'll rephrase my question for clarity

Federal.