Honoring 42 Years of Mission Readiness
The Department of Veterans Affairs administers national cemeteries and burial benefits. Their website contains a wealth of useful information.
The U.S. Department of Veterans Affairs
Religious emblems currently available for inclusion on federally supplied headstones:
Burial & Memorials
National Cemetery Locations
The American Civil Liberties Union publishes a Q&A regarding the process of requesting religious emblems for inclusion on federally-supplied headstones; included herein are data regarding the 2007 controversy about adding the Wicca emblem
ACLU - Religious Symbols on Headstones: Questions and Answers