This is what you need to know:

According to the Department of Defense, starting Jan. 1, 2020, all service-connected Veterans, Purple Heart recipients, former prisoners of war (POW), and individuals approved and designated as the primary family caregivers of eligible Veterans under the Department of Veterans Affairs Program of Comprehensive Assistance for Family Caregivers (PCAFC) can use commissaries, exchanges, and morale, welfare and recreation (MWR) retail facilities, in-person and online.
Eligibility Fact Sheet