H. R. McMaster

Herbert Raymond "H. R." McMaster (born July 24, 1962) is an American Lieutenant General in the United States Army and author. He was the 26th United States National Security Advisor from February 20, 2017 to April 9, 2018. He was commander of the Maneuver Center of Excellence at Ft. Benning, Georgia. 
McMaster served as Director of Combined Joint Interagency Task Force-Shafafiyat (CJIATF-Shafafiyat) (Transparency) at ISAF (International Security Assistance Force) Headquarters in Kabul, Afghanistan. He is known for his roles in the Gulf War, Operation Iraqi Freedom and Operation Enduring Freedom.
McMaster resigned as National Security Advisor on March 22, 2018, which became effective on April 9, 2018. He was replaced by John R. Bolton.