You can contact the U.S. Department of Defense. Submit any and all personal data and mail it to:. . United States Department of Defense. Office of the Secretary of Defense . Washington, D.C.. . Or, you can write your congressman at the following address:. . United States Congressman....full name. United States House of Representatives. Washington, D.C.. . Or, you could even try to contact the American Legion, The Veterans Administration or the local library may be of some assistance.. . Just remember to include as much information about you father as possible, including SSAN, Service number, date of birth and address and date of his passing and especially his military address you may copy from any letters when he wrote home,....etc.. . Good luck.