Air Force Photos

Susan Zerbe prepares to place a wreath on the headstone for her son, Tech. Sgt. Daniel Lee Zerbe, who was one of 30 U.S. troops killed when a CH-47 Chinook helicopter was shot down in Afghanistan in 2011. Susan and other family members of fallen troops as well as thousands of volunteers were at the Arlington National Cemetery, Va., on Dec. 12, 2015, for Wreaths Across America Day, an event to honor veterans during the holidays. (U.S. Air Force photo/Sean Kimmons)

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Photo by: Sean Kimmons |  VIRIN: 151212-F-XXXXX-004.JPG