There are those who will call that stolen valor, so probably best not to try.
On a couple of past occasions I've seen someone get themselves in deep doodoo and peril of life and gotten involved in bringing them to safety, but that was because that's the right thing to do when a situation happens. It's never been my paid duty, so I don't claim FR status.
Now, I'm wondering how many ordinary folk see something like this FR discount, or a senior's discount at a restaurant or such, and see it as the rest of us paying too much. Probably happens, but a lot of others are willing to tip the favoured group.