AMVETS National Service Foundation's official business hours are Monday through Friday from 8:00am to 4:30pm EST. Physical Address: AMVETS National Service Foundation 4647 Forbes Boulevard Lanham, MD 20706 Mailing Address: P.O. Box 96175 Washington, DC 20090-6175 Phone Numbers: Toll Free (800) 810-7148 Phone (301) 459-6181 Fax (301) 459-5578 Driving Directions: Click here for directions from your location.