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Yes, it all depends on the particular sailing and not guaranteed.  Here are the details for Military, EMT/Firefighter & Senior discounts from Royal's FAQ page.

Unlike most, I don't care what you wear to dinner.
 
It's your vacation, you paid for it, you enjoy it the way you see fit as long as you aren't offending others by doing something that isn't appropriate in public.

I called Cruise Planners and we are all set with reservations. On the app, it states Izumi Sushi and not Izumi Hibachi which was throwing me off. I was told that we would pay $34.99 per person which reserves our place for the Hibachi.