I am housing a male veteran. I do not collect rent. He has his own room and bath. We share meals. Can I use him as a deduction
Not sure how long your veteran roommate has lived with you--you do not say. There is a possibility you could get the $500 credit for other dependents for him--that is all, if you can even get that. If you claim him, be aware that a person who is claimed as a dependent does NOT get the $1200 stimulus money.
CREDIT FOR OTHER DEPENDENTS
Kudos to you for helping our veterans get on their feet after the sacrifices many of them have made. At best, they might qualify as a dependent under the "qualifying relative dependent" rules, which are different from the qualifying child rules.
YOu can view those rules at https://apps.irs.gov/app/vita/content/globalmedia/table_2_dependency_exemption_relative_4012.pdf