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  1. Primary Image Source – Shutterstock/WikipediaCommons/DVIDSHUB
  2. Thumbnail Image Source - adobe firefly
  3. Primary Background Footage Source - EnvatoElements
  4. Secondary Background Footage Source - PreLinger archives/WikipediaCommons
  5. Any other footage used listed under Creative Commons CC0, CC1, CC2, CC3 or CC4
  6. https://creativecommons.org/publicdomain/zero/1.0/
  7. https://creativecommons.org/licenses/by/1.0/
  8. https://creativecommons.org/licenses/by/2.0/
  9. https://creativecommons.org/licenses/by-sa/3.0/deed.en
  10. https://creativecommons.org/licenses/by/4.0/
  11.  
  12. Other footage sources we may use;
  13. - National Park Service Public Domain B-Roll
  14. - NOAA
  15. - NASA
  16. - USGS
  17. - DoD
  18. - Creative Commons videos on YouTube if we can verify that the source is original.
  19. The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement.
  20. The appearance of ANY U.S. Government visual information does not imply or constitute endorsement by any government agency or affiliated agency.