What does it mean when your orders get amended?

As a side note, I recommend you start prepping your defense for the QMP

Read the amended orders and it will say what is amended

If you're flagged for alcohol related reasons (i.e., Flag code A), then you're prohibited (except in a few cases) of being reassigned until the flag is lifted. Suggest you read up on AR 600-8-2* (especially paragraphs 2-8 and 3-1) and become familiar with the impacts the flag will cause you.

CSM Darieus ZaGara, MSG (Join to see), and SFC (Join to see) all have great comments regarding this - In addition to the amendment, there are long reaching effects you'll have to consider.
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* https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN30769-AR_600-8-2-000-WEB-1.pdf

The ammendment can be a couple of things, you have to look at them. There a few options the command has, however the Army at the next board will likely QMP you. Based on the type and severity of the alcohol incident will determine your fate. Your BC does not issue a GOMOR, that is a letter from a General Officer.

1. Flagged mean's 0/NO personnel actions will be taken until resolved. So once it is resolved and the flag lifted, HRC will decide to change your report date, or cancel your orders.

Generally, and I am guessing that this has not changed since I retired, but the first or second paragraph after you get past that who you are and where you are rubbish might tell you old boy!