Smithsonian National Postal Museum, Washington, D.C.

The National Museum of the U.S. Air Force, located at Wright-Patterson Air Force Base near Dayton, Ohio, has temporarily closed its doors.

The Military Aviation Museum has canceled its largest fundraiser of the year, the airshow "Warbirds Over the Beach," scheduled for this weekend.

The Foxbat could fly at extreme speeds—but in doing so, it would risk damage to the airframe and engines, which were far less sophisticated than their American counterparts.