When our US Navy Veterans group wanted to go for a ride on Skyline Drive, which is in the Shenandoah National Forest I found that the USGS issues what is called the America the Beautiful Access Pass which will get people with permanent disabilities into National Parks and other National Recreation Areas for free... I showed the Park Ranger my VA disability paperwork and now I have one!!!!!! To my surprise our entire group has permanent disabilities (as deemed by the Veterans Administration) and we all have the passes now.
It also MAY get you a 50% discount on camping and other things... It will NOT get you free parking.
Click HERE to learn more.