trading all kinds of commodities and fighting rival factions, rather than on conducting combat operations. However, as the KPNLAF opposed all communist factions, it constituted the second largest guerrilla force. By 1981, with about 7,000 men under arms, it was able to protect its border camps and conduct occasional forays further inland. Beginning in 1986 the KPNLAF declined as a fighting force as it lost its bases at the Thai–Cambodian border, following the Vietnamese dry season offensive of 1984/85. Inflexible and unable to adapt to new conditions, combatants were "virtually immobilized by the loss of their camps." Additionally, senior commanders began to oppose the "dictatorial ways" of president Son Sann, who regularly interfered into "military matters". Units deserted or demobilized in order to await the outcome of leadership clashes; this led to the collapse of the central chain of command, and stagnation and collapse of the entire KPNLAF structure. 1987 estimates of KPNLAF unit strength varied within a maximum total of 14,000 troops. The KPNLAF divided Cambodia into nine military regions or operational zones, and was headed by a general officer (in 1987, by General Sak Sutsakhan) who functioned as commander in chief, a chief of staff, and four deputy chiefs of staff in charge of military operations, general administration, logistical affairs, and planning/psychological operations respectively. Combat units were divided into battalions, regiments, and brigades. The KPNLAF received most of its military equipment from China. However, further aid and training was granted by ASEAN nations such as Singapore and Malaysia. Armée Nationale Sihanoukiste The Armée National Sihanoukiste (ANS) constituted the armed component of FUNCINPEC, royalist supporters of Sihanouk also based at the Thai border, and was smaller than the KPRAF. It was founded in June 1981 as a merger of the Movement for the National Liberation of Kampuchea (Mouvement pour la libération nationale du Kampuchea – MOULINAKA) and several minor armed groups. The ANS only began to develop a professional and effective military structure with the formation of the Coalition Government of Democratic Kampuchea, which introduced international shipments of supplies and armaments (mostly Chinese equipment). By 1986/87, the ANS had replaced the KPNLAF (weakened by leadership dispute) as the primary non-communist rebel force. Figures of ANS personnel strength during the 1980s are based on the statements of Sihanouk and his son Prince Norodom Ranariddh (since 1987 commander in chief and chief of staff), ranging from 7,000 to a maximum of