F-16 Vipers from the 138th Fighter Wing participate in an elephant walk, June 4, 2021, at Tulsa Air National Guard Base, Okla. The elephant walk, or taxiing of military aircraft prior to takeoff, was part of a large-scale readiness exercise that was conducted to test the wing's ability to rapidly deploy combat-ready forces around the globe. (U.S. Air National Guard photo by Tech. Sgt. Rebecca Imwalle)