General Joseph Dunford, chairman of the U.S. Joint Chiefs of Staff, speaks as James Mattis, U.S. secretary of defense, right, listens during a Senate Appropriations Subcommittee hearing in Washington, D.C., U.S., on Wednesday, March 22, 2017. The $5 billion to fight Islamic State terrorists included in the Trump administrations $30 billion supplemental request is needed to avoid further erosion of readiness, Mattis and Dunford said during the hearing. Photographer: Andrew Harrer/Bloomberg via Getty Images