Being a patient at a VA hospital lets you fish in Montana without a license. Instead of a license you carry documentation signed by VA hospital staff saying you are currently a patient.
There is nothing to apply for. Ask VA hospital staff to sign documentation confirming you are a current patient, and carry it while fishing. For questions call Montana Fish, Wildlife and Parks at 406-444-2535 or email fwpgen@mt.gov.
Documentation signed by VA hospital staff confirming that you are currently a patient.