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Col. Jenise Carroll, 75th Air Base Wing commander, and Chief Master Sgt. Christopher Walker, 75th ABW command chief, visit with Senior Airman Kevin Alvaran and Senior Airman Craig Sarnak to thank them for their clean-up efforts April 22, 2021, at Hill Air Force Base, Utah. Alvaran and Sarnak, both from the 49th Civil Engineer Squadron at Hollman AFB, N.M., were on a temporary duty assignment to Hill and met to pick up litter along the base's trails in celebration of Earth Day. (Courtesy photo)