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 IMAGE: Download Image: Full Size (0.56 MB) Tags: Defense Secretary , President, army, Trump, chairman, secdef, Esper, milley Photo By: Army Staff Sgt. Brandy Nicole Mejia, DOD VIRIN: 191220-D-AP390-1232C.JPG Photo Gallery