Homeless veterans could benefit if they were allowed P.O. Boxes. They would be able to receive mail, V.A. notices, Medications, and the general ability to send and receive mail as street address people.
With proper I.D. and email address, cell phones, and any internet devices, they can be found and contacted. In these modern times, a physical street address is less applicable to all persons.
Homeless Vets as myself can not afford, so have no access to a physical street address. A P.O. Box is far more ecconomical.