As a major element in his counterinsurgency policy, Ngo Dinh Diem (President 1954–1963) had earlier introduced the establishment of strategic hamlets in order to contest Viet Cong operations in the countryside. From several antecedents the controversial Phoenix program was launched during 1967–1968. Various Vietnamese forces (intelligence, military, police, and civilian) were deployed in the field against Viet Cong support networks. The CIA played a key role in its design and leadership, and built on practices developed by Vietnamese, i.e., the provincial chief, Colonel Tran Ngoc Chau. Many other Americans worked to monitor and manage the Phoenix program including, according to Helms, "a seemingly ever-increasing number of CIA personnel".