Staff Sgt. Jack Toeller, 319th Civil Engineer Squadron, allows 5th- and 6th-grade students from St. Joseph’s Catholic School in Devils Lake, N.D., to find out how heavy a fireman’s oxygen tank really is during a base tour on April 26, 2013. Grand Forks Air Force Base offers base tours each Friday from March through October. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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