Signing Moment Defense Secretary Dr. Mark T. Esper and Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, attend the National Defense Authorization Act signing by President Donald J. Trump at Joint Base Andrews, Md., Dec. 20, 2019. SHARE: Download: Full Size (0.56 MB) Tags: Defense Secretary , President, army, Trump, chairman, secdef, Esper, milley Credit: Army Staff Sgt. Brandy Nicole Mejia, DOD VIRIN: 191220-D-AP390-1232C.JPG Photo Gallery