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Master Sgt. Jose Lopez, 341st Missile Wing administration functional area manager, puts a tree guard around a tree during National Public Lands Day Sept. 24, 2016, at Malmstrom Air Force Base, Mont. NPLD is the nation’s second largest, single-day volunteer effort for public lands, and occurs annually on the last Saturday in September. (U.S. Air Force photo/Senior Airman Jaeda Tookes)