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H. R. McMaster served as the 25th United States National Security Advisor. He was appointed by President Donald Trump on February 20, 2017, and served until March 13, 2018. McMaster is a retired United States Army general who served in various leadership positions during his 34-year military career, including as the commander of the International Security Assistance Force (ISAF) and United States Forces-Afghanistan (USFOR-A).