Week in Photos is a collection of the best images published on defense.gov during a seven-day period.

Soldiers commence a movement during exercise Saber Guardian 2016 at the Romanian Land Forces Combat Training Center in Cincu, Romania, July 29, 2016. The multinational military exercise involves about 2,800 military personnel from 10 nations. Army photo by Sgt. Tyler Meister

The Air Force’s 45th Space Wing supports United Launch Alliance’s launch of the NROL-61 spacecraft aboard an Atlas V rocket at Cape Canaveral Air Force Station, Fla., July 28, 2016. Before any spacecraft can launch, a team from the space wing provides assurance for a safe lift-off. United Launch Alliance photo

Navy Senior Chief Petty Officer Paul Morreira surveys a landing zone from an MH-53E Sea Dragon during training in mountainous terrain near Camp Dawson, W.Va., July 22, 2016. Morreira is a crewman assigned to Helicopter Mine Countermeasures Squadron 15. Navy photo by Petty Officer 1st Class Barry A. Riley

Navy Secretary Ray Mabus, left, looks on as retired Marine Corps Col. Harvey Barnum, Vietnam War Medal of Honor recipient, signs a poster of the USS Harvey C. Barnum Jr., the Navy ship named after him, during a ceremony at Marine Barracks Washington, D.C., July 28, 2016. DoD photo by U.S. Army Sgt. James K. McCann

Chef Robert Irvine wrestles with Marine Cpl. Matthew Heldt during a physical training event at Naval Air Station Sigonella, Italy, July 28, 2016. Marines completed a circuit course with the celebrity chef, which included upper and lower body workouts and laps. Marine Corps photo by Cpl. Alexander Mitchell

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks to students of the Institute for the Study of War's Hertog War Studies Program in Washington, D.C., July 28, 2016. Undergraduate students learn about the theory, practice, organization and control of war. DoD photo by Army Sgt. James K. McCann

The president has authorized U.S. Central Command to work with partner nations to conduct targeted airstrikes of Iraq and Syria as part of the comprehensive strategy to degrade and defeat the Islamic State of Iraq and the Levant, or ISIL.

A Marine uses hand and arm signals to direct a CH-53E Super Stallion during a support team exercise at Camp Lejeune, N.C., July 19, 2016. Students attended the exercise as part of their required entry-level training. Marine Corps photo by Lance Cpl. Manuel A. Serrano

All 50 states have taken action to ease licensing requirements for military spouses who move across state lines, allowing spouses who hold active professional licenses to continue a career despite frequent moves. It's a milestone that the Joining Forces initiative has been working on for the past five years.

Air Force Staff Sgt. Michael Patterson looks through the center of a C-130J Hercules main landing gear at Camp Lemonnier, Djibouti, July 18, 2016. Patterson is an aerospace propulsion craftsman assigned to the 81st Expeditionary Rescue Squadron. Air Force photo by Staff Sgt. Benjamin Raughton

Defense Secretary Ash Carter has launched a national discussion on building the Force of the Future and what the Defense Department must do to change and adapt to maintain its superiority well into the 21st century.

Navy Petty Officer 1st Class Donisha Brown reunites with her daughter during a homecoming celebration for the USS Ronald Reagan at Fleet Activities Yokosuka, Japan, July 26, 2016.The aircraft carrier participated in 53 days of strike group operations. Navy photo by Petty Officer 3rd Class James Lee