They have discounts for many groups. Ask for their list. I got one for being part of a medical association
If you ride your bike there they give you a discount!
I don't believe there are discount days but there are likely discount prices for active military members.
Same as above.
They are a non-profit natural history museum. They depend on volunteers and public donations. That said, active military get in free.
Thanks! Your answer is awaiting moderation.