Searching for birth siblings

Baby boy born August 17, 1946 at Arlington County Hospital, Arlington, Va. I was adopted approximately 2 weeks later. My adopted father was Assoc. Solicitor in Charge in the Office of the Solicitor, Administrative Division of the Dept. Of Agriculture (USDA South Building) Washington, D.C. My adopted father and birth grandfather were coworkers and associates at the USDA in 1945-46. My adoption was arranged through a private attorney.