Veterans and Gold Star Families now get a free pass to national parks, wildlife refuges, and other public lands. The new pass provides free lifetime access and waived recreation fees. This new benefit as announced on Veteran’s Day this year.
The video attached goes into detail. You can request your pass from the link
https://www.nps.gov/planyourvisit/veterans-and-gold-star-families-free-access.htm
http://dlvr.it/ScvQYq