So here is what's likely going to happen. The Marines in question will get article 15s (Non-Judicial Punishment). Thell get charged with disobeying lawful orders and Article 134, probably a couple others. It'll be battalion level so they'll lose 2 ranks, 60 days pay, have 60 days restriction (confinement outside of the brig), and be non recced for the rest of their careers. That means after their contract is up they won't be allowed to reenlist, so if they wanted a career that is no longer an option. They will get a Other Than Honorable discharge, which means they don't get any veterans benefits, especially with education. This mean when they are forced out they'll be in their mid to late 20s, without any sort of job skill or education. They won't be able to get a decent job, at least a few are likely to become homeless and/or drug addicts.
I've seen it happen for less.