Because the active personnel strength of the ground forces is around 30,000--sufficient to man only about two divisions--the brigade has been chosen as the basic tactical unit. The brigades are manned with approximately 3,000 men each, and there are probably one tank and five infantry brigades. The infantry brigades are believed to contain three infantry battalions and a lightly equipped artillery regiment. The tank brigade has Soviet-built weapons. Most of them are World War II T-34 medium tanks, but there are a few of the later model T-54s. Almost all artillery is light and small caliber, since movement of heavy equipment is nearly impossible over much of the terrain. In addition, heavy weapons, their transport, or even their ammunition could not be produced locally, and little resupply from external sources could be expected in any lengthy conflict. In so small an area the rapid movement of forces would serve little purpose. The minimal amount of transport equipment available includes small numbers of Soviet-designed armored personnel carriers, command cars, and a few types of trucks. Before 1961 training was based on Soviet methods, and specialized schools were scaled-down copies of those in the Soviet army. Training manuals were translated from the Russian. Although external support of the forces has been transferred from the Soviet Union to Communist China, the Chinese have apparently not required basic changes in the training programs. Most conscripts have been exposed to a considerable amount of drill and elementary basic training in school and in Communist youth organizations, permitting the forces to concentrate on tactical exercises. These consist mostly of small unit activities and involve fighting techniques appropriate to the defense of the mountainous interior. Physical conditioning, tactics involving light weapons, and operations using a minimum of materiel support are emphasized on a continuing basis. Political indoctrination, conducted or supervised by the political commissars, is heavily administered in all training programs. Naval Forces