A rating of 3 alone is insufficient to determine the impact of your disenrollment on your future military options. That rating just advises you should not be considered without weighing the needs of the service against the reasons for this disenrollment that were documented.
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Purely for your own reflection, look at the reasons listed in section III in your DD-785? Why did someone call attention to these for future readers? Will these present as a concern to the ROTC unit or the Navy?
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We can pontificate on this but instead recommend you meet with the ROO of the ROTC unit you wish to train in, and discuss your options. Bring a copy of the form, and lay it out. Own the mistake if there was one, and discuss your desire to serve. Overall I recommend young (and old) people look to not be defined by their mistakes and being able to honestly discuss them, own them, and move beyond them will speak well of your character. I have failed at jobs, some personal relationships despite best efforts and I think those failures taught me a great deal - your experiences can teach you, as well. Let us know what you find out please.
Much like my guidance for people interested in flying to get up in the air and make sure there's nothing stopping you, you should do the same here. Go for it, and I hope it works out for you.
If you're talented enough to gain admission to USNA then you have high potential and I wish you the best at fulfilling that potential and achieving your goal to serve as an officer. Best of luck to you.