Military leadership

FILE - In this Nov. 28, 2018, file photo, then-Secretary of Defense Jim Mattis speaks with reporters before welcoming Lithuanian Minister of National Defense Raimundas Karoblis to the Pentagon in Washington. When he resigned as defense secretary last December, Mattis thought it might take two months to install a successor. That seemed terribly long at the time. Seven months later, the U.S. still has no confirmed defense secretary even with the nation facing potential armed conflict with Iran. It’s the longest such stretch in the history of the Pentagon. (AP Photo/Cliff Owen, File)

Gen. Mark Milley speaks at a Senate Armed Services Committee hearing on Capitol Hill in Washington, Thursday, July 11, 2019, for reappointment to the grade of general and to be Joint Chiefs of Staff Chairman. (AP Photo/Andrew Harnik)

FILE - In this April 11, 2019, file photo, U.S. Strategic Command Commander Gen. John Hyten testifies before a Senate Armed Services Committee hearing on Capitol Hill in Washington. A senior military officer has accused, Hyten, the Air Force general tapped to be the next vice chairman of the Joint Chiefs of Staff, of sexual misconduct, potentially jeopardizing the nomination as members of Congress raised questions about the allegations and an investigation that found insufficient evidence to charge him. (AP Photo/Andrew Harnik, File)

Acting Secretary of Defense Mark Esper waits for the arrival of Qatar's Emir Sheikh Tamim bin Hamad Al Thani to the Pentagon in Washington, Monday, July 8, 2019. (AP Photo/Susan Walsh)

FILE- In this Sept. 10, 2016, file photo. Adm. William Moran speaks during the Commissioning of the USS Montgomery in Mobile, Ala. Moran, the Navy admiral set to become his service's top officer on Aug. 1, 2019, says he will instead retire. The extraordinary downfall of Moran was prompted by what Navy Secretary Richard Spencer on Sunday, July 7 called poor judgment. Spencer faulted Moran for having a professional relationship with a person who had been disciplined for what Spencer called "failing to meet the values and standards of the naval profession." (Albert Cesare/Montgomery Advertiser via AP, File)

Russian President Vladimir Putin listens to Russian Defense Minister Sergei Shoigu during their meeting in the Kremlin in Moscow, Russia, Tuesday, July 2, 2019. A fire on one of the Russian navy's deep-sea submersibles killed 14 sailors, the Russian Defense Ministry said Tuesday without giving the cause of the blaze or saying if there were survivors. (Alexei Druzhinin, Sputnik, Kremlin Pool Photo via AP)

Navy Special Operations Chief Edward Gallagher, right, walks with his wife, Andrea Gallagher as they arrive to military court on Naval Base San Diego, Wednesday, June 26, 2019, in San Diego. Trial continues in the court-martial of the decorated Navy SEAL, who is accused of stabbing to death a wounded teenage Islamic State prisoner and wounding two civilians in Iraq in 2017. He has pleaded not guilty to murder and attempted murder, charges that carry a potential life sentence. (AP Photo/Julie Watson)

This undated selfie provided by Andrea Gallagher shows her husband, U.S. Navy SEAL Edward Gallagher, who has been charged with allegedly killing an Islamic State prisoner in his care and attempted murder for the shootings of two Iraq civilians in 2017. Gallagher is scheduled to go on trial Monday, June 17, 2019. (Edward Gallagher/Courtesy of Andrea Gallagher via AP, File)

Acting Defense Secretary Mark Esper arrives at the Pentagon in Washington, Monday, June 24, 2019. (AP Photo/Andrew Harnik)