You can get free Pennsylvania hunting and furtaker licenses if you are a resident veteran with a disability incurred in war or armed conflict. The source calls these lifetime licenses but also says they must be renewed every year.
Request your first free license from a county treasurer or a Pennsylvania Game Commission office. After that you can renew at any license issuing agent or online through HuntFishPA.
Proof you are a Pennsylvania resident and VA documentation of your disability, showing loss or loss of use of a limb, a 100 percent rating, or that you are individually unemployable and compensated at the 100 percent rate.