sentences:  The NDC was founded in on 2 February 1955 by Field Marshal Plaek Phibunsongkhram by opening the study for top executives of the military and civilian sectors only.Later in 1989, the National Defense Course for the Joint State-Private Sector was opened so that business executives at the level of business owners or executives have been educated with senior executives of the government.In 2003, opened the National Defense Course for national, private, and political by accepting more politicians.