U.S. Naval Academy Superintendent Vice Adm. Ted Carter welcomes Secretary of Defense Ash Carter as he arrives by helicopter to attend the change of command ceremony between Adm. Jonathan Greenert, Chief of Naval Operations, and Adm. John Richardson, held at the U.S. Naval Academy in Annapolis, Md., Sept. 18, 2015. (DoD Photo by Glenn Fawcett/Released)

Gov. Gary Herbert activated the Utah National Guard to assist local first responders in search and rescue efforts after flash floods hit the border town of Hildale, Utah. Soldiers from the Utah Guard 2-222nd Field Artillery Battalion were dispatched from the nearby communities of St. George and Cedar City to aid in the rescue efforts. The flood, which raged out of Maxwell Canyon and through the tiny border town of Hildale and Colorado City, Ariz., about 5 p.m. on Monday, is believed to be the single most deadly weather event in Utah history. (Courtesy Photo Utah National Guard / Released)

Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, talks with and takes questions from U.S. Soldiers of the 173rd Airborne Brigade at the Estonian 1st Brigade Headquarters in Tapa, Estonia, Sept. 15, 2015. (DoD photo by D. Myles Cullen/Released)

Runners deployed to support Operation Inherent Resolve start the Air Force Marathon half and 10K races at an undisclosed location in Southwest Asia, Sept. 19, 2015. The Air Force Marathon is held the third Saturday in September each year, 2015 marks the 19th year the race has been officially held. (U.S. Air Force photo/Tech Sgt. Brittany E. Jones)

Hungarian Defense Forces members stand watch as U.S. Soldiers assigned to the 4th Squadron, 2nd Cavalry Regiment conduct a deliberate water crossing in their M1126 Stryker Combat vehicles using a bypass bridging site during Dragoon Crossing, a tactical road march in support of Operation Atlantic Resolve, in Gyor, Hungary, September 17, 2015. The U.S. and partner nations conducted land, sea and air exercises and maintained a rotational presence in order to reinforce NATO security commitments in Europe. (U.S. Army photo by Sgt. William A. Tanner/Released)

U.S Navy Chief Hospital Corpsman Kevin Robinson, right, a native of Crawfordsville, Ark., assigned to Naval Medical Center Portsmouth, Va., places a combination cover on Chief Mass Communication Specialist Amy Kirk, a native of Eden, N.C., assigned to Navy Public Affairs Support Element East, Norfolk, Va., during the chief petty officer pinning ceremony aboard the Military Sealift Command hospital ship USNS Comfort (T-AH 20)PORT AU PRINCE, Haiti, Sept. 16, 2015, during Continuing Promise 2015. Continuing Promise is a U.S. Southern Command-sponsored and U.S. Naval Forces Southern Command/U.S. 4th Fleet-conducted deployment to conduct civil-military operations including humanitarian-civil assistance, subject matter expert exchanges, medical, dental, veterinary and engineering support and disaster response to partner nations and to show U.S. support and commitment to Central and South America and the Caribbean. (U.S. Navy photo by Mass Communication Specialist 3rd Class Andrew Schneider/Released)

U.S. Soldiers assigned to 4th Squadron, 2nd Cavalry Regiment, explain their equipment and vehicles to children at a static display during Dragoon Crossing, a tactical road march in support of Operation Atlantic Resolve, in Bratislava, Slovakia, Sept. 16, 2015. The U.S. and partner nations conducted land, sea and air exercises and maintained a rotational presence in order to reinforce NATO security commitments in Europe. (U.S. Army photo by Spc. Jacqueline Dowland/Released)

A Royal Australian Air Force E-7A Wedgetail receives fuels from an Air National Guard KC-135 Stratotanker that is deployed to the 340th Expeditionary Air Refueling Squadron at Al Udeid Air Base, Qatar over Iraq, Sept. 16, 2015. (U.S. Air Force photo by: Staff Sgt. Alexandre Montes/ Released)

Estonian Lt. Gen. Riho Terras, Commander of Estonian Defense Forces, introduces his staff to U.S. Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, at the Estonian Defense Forces Headquarters in Tallinn, Estonia, Sept. 14, 2015. (DoD photo by D. Myles Cullen/Released)

A Spanish sailor monitors the flight deck of the amphibious assault ship Juan Carlos I (L-61) as a U.S. Marine Corps MV-22B Osprey tiltrotor aircraft conducts deck landing qualifications in the Mediterranean Sea Sept. 9, 2015. (U.S. Marine Corps photo by Staff Sgt. Vitaliy Rusavskiy)

The USNS Comfort (T-AH-20) sits off the coast of Carrefour, Haiti, during Continuing Promise 15, Sept. 14, 2015. Continuing Promise is a U.S. Southern Command-sponsored and U.S. Naval Forces Southern Command/U.S. 4th Fleet-conducted deployment to conduct civil-military operations including humanitarian-civil assistance, subject matter expert exchanges, medical, dental, veterinary and engineering support and disaster response to partner nations and to show U.S. support and commitment to Central and South America and the Caribbean. (U.S. Marine Corps photo by Sgt. James R. Skelton/Released)

U.S. Marine Corps MV-22B Osprey tiltrotor aircraft pilots assigned to Special-Purpose Marine Air-Ground Task Force Crisis Response-Africa coordinate air operations with Spanish sailors aboard the amphibious assault ship Juan Carlos I (L-61) during deck landing qualifications in the Mediterranean Sea Sept. 9, 2015. (U.S. Marine Corps photo by Staff Sgt. Vitaliy Rusavskiy)

Runners deployed in support of Operation Inherent Resolve participate in the Air Force Half Marathon at a deployed location in Southwest Asia, Sept. 19, 2015. In 2015, 1,950 athletes registered to run the marathon at deployed locations overseas. (U.S. Air Force photo by: Tech. Sgt. Brittany E. Jones/ Released)

A guest at the POW/MIIA National Recognition Day smiles following the ceremony at the Pentagon River Terrace Parade Field in Washington, D.C., Sept. 18, 2015. (DoD photo by Senior Master Sgt. Adrian Cadiz)

U.S. Army Spc. Mixocoatl Ocampo, a gunner with the 4th Squadron, 2nd Cavalry Regiment gathers his ammo for a combined live fire range during Operation Slovak Shield, in support of Operation Atlantic Resolve, near Pelisky, Slovakia, Sept. 16, 2015. The U.S. and partner nations conducted land, sea and air exercises and maintained a rotational presence in order to reinforce NATO security commitments in Europe. (U.S. Army photo by Sgt. Juana M. Nesbitt/Released)

Slovakian Soldiers hit their target during a combined live fire range during Operation Slovak Shield, in support of Operation Atlantic Resolve, near Pelisky, Slovakia, Sept. 16, 2015. The U.S. and partner nations conducted land, sea and air exercises and maintained a rotational presence in order to reinforce NATO security commitments in Europe. (U.S. Army photo by Sgt. Juana M. Nesbitt/Released)

U.S. Air Force pararescuemen are hoisted into an HH-60G Pave Hawk helicopter during training at an undisclosed location in Iraq, Sept. 15, 2015. Pararescuemen are on 24-hour alert and train extensively in emergency medical tactics, combat survival, and personnel recovery to support Operation Inherent Resolve. (U.S. Air Force photo/Tech. Sgt. Brittany E. Jones)

Rubber ball rounds strike a target during munitions training as part of Non-lethal Weapons Executive Training, Sept. 15, 2015. The Non-Lethal Weapons Executive Seminar (NOLES) is an annual Marine Corps Forces Pacific theater security cooperation event focusing on the use of nonlethal weapons. The exercise is held in a different nation each year. (U.S. Marine Corps photo by Sgt. Erik Estrada)

Secretary of Defense Ash Carter, left, meets with Saudi Prince Mohammad bin Salman, the deputy crown prince and minister of defense of Saudi Arabia, at the Four Seasons Hotel in Washington, D.C., Sept. 4, 2015, to discuss matters of mutual importance. (DoD photo by Senior Master Sgt. Adrian Cadiz, U.S. Air Force)

Chairman of the Joint Chiefs of Staff U.S. Army Gen. Martin E. Dempsey speaks during the 16th Annual Newman's Own Awards held in the Pentagon's Hall of Heroes in Arlington, Va., Sept. 2, 2015. During the ceremony, awards totaling $200,000 were presented to six military nonprofit organizations for their innovative programs to improve military quality of life. (DoD photo by Staff Sgt. Sean K. Harp, U.S. Army)