22d Aero Squadron - photos
United States Air Force
1918
<a rel="nofollow" class="external free" href="http://www.angelfire.com/ct/US22/History_of_US22nd_Aero_Sq.pdf">http://www.angelfire.com/ct/US22/History_of_US22nd_Aero_Sq.pdf</a> via United States Army Air Service