National Museum of the United States Air Force, Dayton, Ohio, 04/12/2019 Kellett K-2 Autogiro c/n 2 NC10767 This machine had been used in the Army evaluation of 1931, This work is licensed under a Creative Commons Attribution- NonCommercial 4.0 International License.

National Museum of the United States Air Force, Dayton, Ohio, 04/12/2019 Martin YB-10, C/N: 514 33-146, Ryan YPT-16 (STA) c/n 312 40-0044 Fairchild PT-19A-FA Cornell C/N: TA42-3589 42-34023 painted as 41-14666 This work is licensed under a Creative Commons Attribution- NonCommercial 4.0 International License.