President Barack Obama, Secretary of Defense Ash Carter and Marine Gen. Joseph F. Dunford Jr., the new chairman, applaud outgoing Chairman of the Joint Chiefs of Staff Army Gen. Martin E. Dempsey during the change of responsibility ceremony at Summerall Field, Joint Base Myer-Henderson Hall, Arlington, Va., Sept. 25, 2015. DoD photo by U.S. Army Sgt. 1st Class Clydell Kinchen
New Jersey Air Force National Guard members Jake Kaiser, left, of Freehold, N.J., and Nicole Marcus, of Mount Laurel, N.J., patrol the Benjamin Franklin Bridge, Sunday, Sept. 27, 2015, in Philadelphia. The bridge was shut down to vehicular traffic over the weekend during the Pope Francis' visit to the city. (AP Photo/Julio Cortez)
Soldiers from the 82nd Airborne Division jump from a C-17 aircraft as part of the U.S. militaryÕs Network Integration Evaluation at White Sands Missile RangeÕs Space Harbor, Sunday, Sept. 27, 2015 in New Mexico. Approximately 600 jumped from 1,000 feet to to confront about 200 soldiers on the ground acting as enemy combatants. (Jett Loe/The Las Cruces Sun-News via AP) MANDATORY CREDIT
Marines from Battery B, 1st Battalion, 11th Marine Regiment, fire rounds down range in support of Supporting Arms Coordination Center Exercise on San Clemente Island, Calif., Sept. 25, 2015.The exercise is the first the Marines and Sailors will work together at sea as they prepare for deployment to the Pacific and Central Command areas of responsibility in early 2016. (U.S. Marine Corps photo by Lance Cpl. Alvin Pujols/Released)
U.S. Marines with the Maritime Raid Force, 13th Marine Expeditionary Unit (MEU), 1st Marine Expeditionary Force, conduct a visit, board, search and seizure aboard a simulated enemy vessel during the PHIBRON-MEU integration exercise off the coast of San Clemente Island, Sept. 23, 2015. This marks the first at-sea exercise for the PHIBRON-MEU Marines and Sailors as they work together in preparation for deployment to the Pacific and Central Command areas of responsibility in early 2016. (U.S. Marine Corps photo by Sgt. Tyler C. Gregory/released)
150925-N-YR391-172 PACIFIC OCEAN (Sept. 25, 2015) Ensign Thomas Schofer disembarks a rigid-hull inflatable boat to climb aboard the amphibious transport dock ship USS New Orleans (LPD 18) after completing a visit, board, search, and seizure training exercise. New Orleans is underway for its amphibious squadron and marine expeditionary unit integrated training in preparation for their upcoming deployment. (U.S. Navy photo by Mass Communications Specialist 1st Class Gary Granger Jr./Released)
U.S. Marines with India Company, 3rd Battalion, 7th Marine Regiment, Special Purpose Marine Air-Ground Task Force—Crisis Response—Central Command, conduct fast rope training from an MV-22 Osprey while deployed to Southwest Asia, Sept. 16, 2015. Fast roping allows Marines to insert ground forces quickly from the air, without the need for a stabilized landing zone. The Marines and Sailors of SPMAGTF-CR-CC provide the commander of USCENTCOM with a unique set of solutions to emergent crises across a broad swath of the Middle East. (U.S. Marine Corps Photo by Cpl. Leah Agler/RELEASED)
150924-N-PN275-061 APRA HARBOR, Guam (Sept. 24, 2015) The Los Angeles-class attack submarine USS City of Corpus Christi (SSN 705) maneuvers into position to moor alongside the submarine tender USS Emory S. Land (AS 39) to complete repair maintenance actions. Emory S. Land is a forward deployed expeditionary submarine tender on an extended deployment conducting coordinated tended moorings and afloat maintenance in the U.S. 5th and 7th Fleet area of responsibility. (U.S. Navy Photo by Mass Communication Specialist Seaman Zachary A. Kreitzer/Released)
150926-N-HP195-022 NAVAL BASE VENTURA COUNTY, Calif. (Sept. 26, 2014) All six Blue Angels' F/A-18 Hornets fly in delta formation above spectators at the 2015 Point Mugu Air Show on Naval Base Ventura County. (U.S. Navy photo by Mass Communication Specialist 1st Class Christopher Okula/Released)
Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, lays a wreath at the Tomb of the Unknown Soldier in Arlington National Cemetery, Va., Sept. 25, 2015. Hosting the wreath laying ceremony was Maj. Gen. Bradley A. Becker, commanding general, Military District of Washington. Dempsey laid the wreath to honor the Unknown Soldiers as he retires after 41 years of service. (U.S. Army Photo by Spc. Cody W. Torkelson)
Soldiers prepare a flag for the pre game ceremony before an NFL football game between the Tennessee Titans and the Indianapolis Colts Sunday, Sept. 27, 2015, in Nashville, Tenn. (AP Photo/James Kenney)