Re-education, or brainwashing.
Because they (Cambodian and Vietnamese) are Happily Married !
Richard M. Nixon introduced the policy of Vietnamization in his speech on November 3, 1969.
nixon
Nixon
July 1969
The Vietnamization plan involved the gradual withdrawal of U.S. troops from Vietnam while increasing the combat role of South Vietnamese forces, thus shifting responsibility for the war onto them. It also included efforts to prepare South Vietnam for self-sufficiency in defending itself against communist aggression.
Re-education, or brainwashing.
Nixon Doctrine
Vietnamization
To honor and memorialize the lives of the nearly 60,000 Americans who died in the Vietnam War, and to those whose whereabouts are still unknown.
Vietnamization differs from the war policies of Nixon's predecessors in the sense that it reflected the Tet Defensive and the following ramifications.
1969..hope this helps =)