@Jack P. Excellent points! First, my original question was more of a theoretical discussion point than asking for advice about offering one as I dont look to others to make my decisions for me (as I am sure you dont which is why we are both in RE when most think we are crazy). I have appreciated the different points of view and actually think I will got with Nathan's suggestion from above.
Second, My typical rents are all slightly above other homes in the areas because we always provide a slightly better than market finishes but I do not advertise any discounts at all and likely never will so it is not a marketing gimmic.
Third, for me it is a personal way to say thank you to LE/Military personel who many times don't receive gratitude for their professions and in some cases receive hostility mearly for wearing a uniform. My family has a proud Military Service history and I have close friends who are LE. This is a small token for me to offer directly to a person, potentially since they have to pass all the same requirements as any tenant.
Finally, after pondering on the other comments about "just dontate to a tax deductiable charity instead" I have realized there is no difference in the bottom line. If I donate 25 per month (300 per year) it comes off the top and if I instead give that same amount as a discount in rent it means it has the same potential tax benefit, right? What am I missing that makes donation better than a discount other than not being able to see the personal impact of the "charity"? Different strokes for different folks...
Thanks again for your input Jack!