The idea of horses has been in the United States Air Force (USAF) even when the USAF was the US Army Air Corps with the North American P-51 Mustangfamily of fighters, today’s KC-46 Pegasus aerial refueler jet tanker, and Joint Base Lewis-McChord’s 8th Airlift Squadron of C-17 Globemasters called the “Workhorses.” Another way that the US Air Force recognizes the horse is by stating that it is a de facto spirit animal by having horse clubs on its bases.