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In page People's Liberation Army:

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During the 1950s, the PLA with Soviet assistance began to transform itself from a peasant army into a modern one.[1] Since 1949, China has used nine different military strategies, which the PLA calls "strategic guidelines". The most important came in 1956, 1980, and 1993.[2] Part of this process was the reorganization that created thirteen military regions in 1955.[citation needed]