The Civil Guard was established in April 1955 by a decree of President Ngo Dinh Diem from members of inactivated wartime paramilitary agencies.
Its primary function was to relieve the regular forces of internal security duties, with additional missions of local intelligence collection and countersubversion.
The Civil Guard was initially under the direct control of the President, but in September 1958 it was placed under the control of the Ministry of the Interior.

In 1955 with the precipitate withdrawal of the French Far East Expeditionary Corps and renewal of hostilities by North Vietnam both considered likely, a six-week civil guard course was instituted for militiamen.

A survey in May 1957 had revealed that there were 54,000 men enrolled in the paramilitary Civil Guard; 7,000 in the municipal police; 3,500 in the Vietnamese Bureau of Investigation, or Sûreté; an undetermined number in the Gendarmerie; and about 50,000 in the Self-Defense Corps.
Impressive in size only, these forces generally were poorly equipped, ill-trained, and poorly disciplined.
Unlike the static, part-time Self-Defense Corps the Civil Guard was a more mobile unit organized to patrol the rural districts and was composed of armed, uniformed, full -time personnel responsible for maintaining law and order and collecting intelligence.
Since May 1955 a group of police and public administration specialists from Michigan State University under contract to the U.S. Operations Mission had been working on a number of projects to improve the training and operations of the security forces.
The group established a six-week basic training course, which had trained 14,000 Civil Guardsmen by mid-1957, and also set up a national police academy.
The Michigan State University advisers saw the Civil Guard as a civilian police force similar to the Texas Rangers.

Diem had different ideas about the guard.
Since the entire ARVN would be needed in the event of invasion to defend along the 17th Parallel, he maintained that a strong internal security organization was crucial to control the Central Highlands and the Mekong Delta.
Thus the Civil Guard should be "capable of assisting the army in rear areas in time of war.”
Diem wanted the Ministry of Defense to assume responsibility for training, disciplining, and supplying the guard, but in peacetime it would remain under the operational control of the interior minister.
He wanted the Civil Guard's officers to be graduates of the military academy and to have an additional year of training in jurisprudence and traffic control.
Since Diem saw the Civil Guard as a kind of second-line army, he wanted it to be unusually well armed and equipped with helicopters and armored cars.
While Diem spoke of internal security and military defense, his real interest in the Civil Guard was political.
Most members of the guard were former militiamen from the Catholic regions of North Vietnam who had fled south after the Viet Minh victory in 1954 and were among Diem's most loyal supporters.
Diem wanted to develop the Civil Guard into a strong force to counter the power of a possibly disloyal army.
When the advisers from Michigan State University insisted that a lightly armed but well-trained territorial police force was more appropriate to the needs of South Vietnam, Diem was contemptuous.
United States Ambassador to South Vietnam Elbridge Durbrow and US Operations Mission chief Leland Barrows were dubious about Diem's plans for the Civil Guard and insisted that the Civil Guard was a civilian police force, not a paramilitary body, and thus ought to remain fully under control of the Ministry of the Interior.
They believed that Washington would probably view a heavily armed, 50,000- man Civil Guard as an attempt to circumvent the 150,000-man ceiling on the South Vietnamese armed forces.
Indeed Durbrow and US Operations Mission chief Leland Barrows believed that the Military Assistance Advisory Group (MAAG) had always wanted a larger army and that MAAG commander General Samuel Tankersley Williams, with Diem's encouragement, was simply using the Civ
The Civil Guard was established in April 1955 by a decree of President Ngo Dinh Diem from members of inactivated wartime paramilitary agencies. Its primary function was to relieve the regular forces of internal security duties, with additional missions of local intelligence collection and countersubversion. The Civil Guard was initially under the direct control of the President, but in September 1958 it was placed under the control of the Ministry of the Interior.
In 1955 with the precipitate withdrawal of the French Far East Expeditionary Corps and renewal of hostilities by North Vietnam both considered likely, a six-week civil guard course was instituted for militiamen.
A survey in May 1957 had revealed that there were 54,000 men enrolled in the paramilitary Civil Guard; 7,000 in the municipal police; 3,500 in the Vietnamese Bureau of Investigation, or Sûreté; an undetermined number in the Gendarmerie; and about 50,000 in the Self-Defense Corps. Impressive in size only, these forces generally were poorly equipped, ill-trained, and poorly disciplined. Unlike the static, part-time Self-Defense Corps the Civil Guard was a more mobile unit organized to patrol the rural districts and was composed of armed, uniformed, full -time personnel responsible for maintaining law and order and collecting intelligence. Since May 1955 a group of police and public administration specialists from Michigan State University under contract to the U.S. Operations Mission had been working on a number of projects to improve the training and operations of the security forces. The group established a six-week basic training course, which had trained 14,000 Civil Guardsmen by mid-1957, and also set up a national police academy. The Michigan State University advisers saw the Civil Guard as a civilian police force similar to the Texas Rangers.
Diem had different ideas about the guard. Since the entire ARVN would be needed in the event of invasion to defend along the 17th Parallel, he maintained that a strong internal security organization was crucial to control the Central Highlands and the Mekong Delta. Thus the Civil Guard should be "capable of assisting the army in rear areas in time of war.” Diem wanted the Ministry of Defense to assume responsibility for training, disciplining, and supplying the guard, but in peacetime it would remain under the operational control of the interior minister. He wanted the Civil Guard's officers to be graduates of the military academy and to have an additional year of training in jurisprudence and traffic control. Since Diem saw the Civil Guard as a kind of second-line army, he wanted it to be unusually well armed and equipped with helicopters and armored cars. While Diem spoke of internal security and military defense, his real interest in the Civil Guard was political. Most members of the guard were former militiamen from the Catholic regions of North Vietnam who had fled south after the Viet Minh victory in 1954 and were among Diem's most loyal supporters. Diem wanted to develop the Civil Guard into a strong force to counter the power of a possibly disloyal army. When the advisers from Michigan State University insisted that a lightly armed but well-trained territorial police force was more appropriate to the needs of South Vietnam, Diem was contemptuous. United States Ambassador to South Vietnam Elbridge Durbrow and US Operations Mission chief Leland Barrows were dubious about Diem's plans for the Civil Guard and insisted that the Civil Guard was a civilian police force, not a paramilitary body, and thus ought to remain fully under control of the Ministry of the Interior. They believed that Washington would probably view a heavily armed, 50,000- man Civil Guard as an attempt to circumvent the 150,000-man ceiling on the South Vietnamese armed forces. Indeed Durbrow and US Operations Mission chief Leland Barrows believed that the Military Assistance Advisory Group (MAAG) had always wanted a larger army and that MAAG commander General Samuel Tankersley Williams, with Diem's encouragement, was simply using the Civ
South Vietnamese Regional Force