In November 1970 the Thai government announced it was planning to withdraw its forces from South Vietnam by 1972. The decision was related to the deterioration of security in Laos and Cambodia and the growth of internal insurgency in Thailand, as well as the ongoing U.S. withdrawal of forces. The withdrawal plans were based on a rotational phase-out. The fifth increment would not be replaced after its return to Thailand in August 1971. The sixth increment would deploy as planned in January 1971 and withdraw one year later to complete the redeployment. On 26 March 1971 the Thai government announced to the United States and South Vietnam that half of the Division would be withdrawn in July 1971, and the remaining half in February 1972 in line with their earlier proposals.