United States
U.S. Army Center of Military History, Ft. McNair, Washington, DC

The Patton Museum of Cavalry and Armor  Ft. Knox, Kentucky

U.S. Navy Museum, Washington Navy Yard, Washington, DC
U.S. Navy Museums
U.S. Naval Historical Center, Washington Navy Yard, Washington, DC

U.S. Air Force Museum, Wright-Patterson AFB, Ohio
U.S. Air Force Field Museums
U.S. Air Force History Support Office, Bolling AFB, Washington, DC
U.S. Air Force Historical Research Agency, Maxwell AFB, Alabama

U.S. Marine Corps History & Museums Division

U.S. Coast Guard Historian's Office, Washington, DC
U.S. Coast Guard Museum, New London, Connecticut

Castle Air Museum, Atwater, California
New England Air Museum, Windsor Locks, Connecticut
National Warplane Museum, Elmira, New York

Worldwide
Austrian Museum of Military History, Vienna, Austria
Bovington Tank Museum, Bovington, United Kingdom

Royal Museum of the Army and Military History, Brussels, Belgium
Canadian Warplane Heritage Museum, Mount Hope, Ontario, Canada
Lubuskie Military Museum, Drzonow, Poland
National Army Museum, Chelsea, London, UK
Scottish United Services Museum, Edinburgh, Scotland, UK

Royal Artillery Museum  London, England

Central Armed Forces Museum  Russia

Panzerworld  Denmark

Important Ordnance-Related websites

Coast Defense Study Group  Dedicated to the study of US Coast Defenses