Everything you need to know about Trump's new national security adviser HR McMaster

Gen. McMaster is taking over for Michael Flynn, who resigned.

Here is what you need to know about McMaster, who is expected to remain on active duty while working with Trump:

Name: Herbert Raymond McMaster

Age: 54

His last job: McMaster has been the director of the U.S. Army Training and Doctrine Command’s Army Capabilities Integration Center since July 2014, which is tasked as the lead architect of the Army.

Hometown: Philadelphia

Education: He graduated from the U.S. Military Academy at West Point in 1984, and received his Ph.D. in military history from the University of North Carolina at Chapel Hill.

What you might not know about him: He also worked as an assistant professor of history at the U.S. Military Academy in the mid-90s.

What he has said or written about national security objectives:

McMaster has been known to speak his mind on military strategy, even when it goes against the status quo. He’s faced delays in promotions at the level of major and colonel, which some suspect were a result of his iconoclastic views.

His doctoral dissertation on the Vietnam War became his first book, “Dereliction of Duty.” The book is a blistering critique of the Joint Chiefs of Staff, who he argued failed to provide necessary military advice to President Lyndon B. Johnson and Secretary of Defense Robert McNamara.

In the conclusion to the book, McMaster wrote, “The war in Vietnam was not lost in the field, nor was it lost on the front pages of the New York Times or the college campuses. It was lost in Washington, D.C."

“Dereliction of Duty” has been recommended reading for Army officers since it was published in 1997.

He’s also notably criticized the way the Bush administration entered the war in Iraq, and last year he told a Senate panel that he feared the Army might become too small to adequately secure the country.

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