U.S. Air Force Staff Sgts. Michael Smith, left and Michael Massey, both assigned to the 374th Civil Engineer Squadron, use chainsaws to cut up an uprooted tree during clean up operations following Typhoon Roke at Yokota Air Base, Japan, Sept. 22, 2011. Typhoon Roke was a category 4 typhoon that stuck Japan and caused downed trees, flooding and landslides.