...the issues with the Brigade Commander, but I am getting tired of this.👎
Hell I'll take a stab at this one. I'm not in the medical corps yet, but in a prior life I was in a supportive role to the line.
By "non-medical officer", I assume you mean a line commander? Or you could mean a nurse or MSC I suppose.
In working with the other folks (non-medical types), I'd make recommendations.
If you tread lightly with your recommendations--in other words, don't make your recommendations so firm, give them some wiggle room, always keeping in mind that they have several other factors to consider--then they're more likely to listen to you and pay heed to your advice. You can tread lightly like this on issues that are not of grave importance (for instance: minor supply or logistical things).
Now, if you have a "hard" recommendation, something firm that you're not willing to budge on--for instance, a psych patient that you don't think should deploy with the unit--then look your commander square in the eye and tell him so. It doesn't matter if he's an O-10. Stand your ground. State your recommendation (with utmost clarity), state your reasons, document all of this, and leave it at that. Your firmness will be respected . . .but the trick here is, you can't make "hard" recommendations about everything (can't cry wolf all of the time).
Your commander may tell you F-- off, and that he's taking said psych pt on the next deployment anyway, b/c he's the best shooter. But that's his decision, and if said pt flips out in country, it's the CO's fault and his career. You did everything you could.