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https://www.thedrive.com/the-war-zone/37131/u-2-spy-plane-got-new-target... ...

Scientific publications are available through the NWRC Research Gateway. https://www.aphis.usda.gov/aphis/ourfocus/wildlifedamage/programs/nwrc/sa_publications/ct_research_gateway ...

https://www.acc.af.mil/News/Article-Display/Article/2557413/accs-u-2-fed... ...