 Complete the following phrase:  Nguyễn Ngọc Lễ 1918-1972 was an officer in the Army of the Republic of Vietnam. He was also the head of the National Police in the 1950s. Lễ strongly advocated the assassination of President Ngô Đình Diệm and his younger brother and advisor Ngô Đình Nhu after they were arrested at the end of an 