U.S. Air Force Staff Sgt. Dylan Cantrell, 633rd Security Forces Squadron military working dog handler, carries his dog Largo, 633rd SFS MWD, during a ruck march in honor of National K9 Veterans Day at Joint Base Langley-Eustis, Virginia, March 13, 2020. Activities like a ruck march help keep the handler and MWD conditioned and mission capable to ensure the safety of service members and civilians.