If you want to get a sense of the size of the US military, check out the Tucson Bone Yard located at the Davis-Monthan Air Force Base. It’s formally known as the 309th Aerospace Maintenance and Regeneration Group (AMARG). This place is amazing. It is where the USAF stores all their old planes for spare parts. These planes can also be returned to flying condition should the need arise. There are so many planes here that it is in effect the world’s third largest air force! They give tours of this place to the public. I’d love to check it out someday.