Assuming this really happened...

As the manager, she should respect the rules of her employer. If her employer says that members of the military should be served, then she must do so.

That said, no, she does NOT need to be counseled on patriotism. Having a strong anti-military belief is not being anti-patriotic.

Nor is it BK's business to teach someone to be patriotic. Follow the rules of the company? Yes. But to change personal beliefs, no.

For example, I am currently doing some work for the US Military. I may disagree with certain aspects of the military, but my job is to my job. If I'm not comfortable reconciling my personal morals with my job, then I need to look for a new job.