Rental Discount for being Law Enforcement/Military

[James M Smith]

So was reading this little known book, "The Book on Managing Rental Properties" by this no name hack Brandon Turner... ;) And noticed in Chapter 4 it mentioned that military history is part of Washington's Fair Housing laws.... This got me to thinking, which is dangerous.  If I were to invest in Washington does this mean I cannot offer discounts for someone who was a military vet in recognition of their service?  I believe the answer is yes because it descriminates against those without military service, which is the flipside of the coin, but wanted to confirm.

TIA,

James