139tth winged mercury air squadron insignia (1917-18) removed from WWI SPAD airplane at March Field Air Museum. Riverside, CA.
Photo by Jim Steinhart © 2021, all rights reserved. (Ref: CAEEV324)

Click an index below to see this photo among related images:

Biplanes of World War I & After
March Field Air Museum, Riverside, CA
World War I in France