In January 1971, a Central Committee meeting was held at this base, bringing together 27 delegates to discuss the war. During 1971, Pol Pot and the other senior party members focused on the construction of a regular Khmer Rouge army and administration that could take a central role when the Vietnamese withdrew. Membership of the party was made more selective, permitting only those regarded as "poor peasants", not those seen as "middle peasants" or students. In July and August, Pol Pot oversaw a month-long training course for CPK cadres in the Northern Zone headquarters. This was followed by the CPK's Third Congress, attended by around 60 delegates, where Pol Pot was confirmed as the Secretary of the Central Committee and Chairman of its Military Commission.