Mark A. Moyar (born May 12, 1971) is the former Director of the Office for Civilian-Military Cooperation at the US Agency for International Development, a political appointment he received during the Trump administration.

[3] He served previously as the Director of the Project on Military and Diplomatic History[4][5] at the Center for Strategic and International Studies, and has been a Senior Fellow at the Foreign Policy Research Institute[6] and a member of the Hoover Institution Working Group on the Role of Military History in Contemporary Conflict.

His articles on historical and current events have appeared in The New York Times, The Wall Street Journal, and The Washington Post.

During his time as a Senior Fellow at the Joint Special Operations University (2013-2015), he published three lengthy studies on special operations—in Colombia, Afghanistan, and Mali: Village Stability Operations and the Afghan Local Police (2014),[8] Countering Violent Extremism in Mali (2015),[9] and Persistent Engagement in Colombia (2014) [10] Moyar is the author of the 2006 book Triumph Forsaken: The Vietnam War, 1954–1965.

The other biggest mistakes according to Moyar were: the failure to cut the Ho Chi Minh trail, and the United States Congress' refusal to support the South Vietnamese government after the 1973 Paris Peace Accords were violated, and the refusal of emergency aid to South Vietnam near the end of the war.