I photographed two Northrop N-9M Flying Wing at the Planes of Fame museum at Chino. Sadly, the example in California was destroyed in a crash during a flight on April 22, 2019.
I did photograph a very similar Northrop N-1M Flying Wing is displayed at the NASM Udvar-Hazy facility during the 447th BG reunion in 2015.
Northrop N-9MB Flying Wing
This plane was destroyed in a crash April 22, 2019