The Zimbabwe National Army (ZNA) is the primary branch of the Zimbabwe Defence Forces responsible for land-oriented military operations. It is the largest service branch under the Zimbabwean Joint Operations Command (JOC). The modern army has its roots in the Rhodesian Army, which was raised between 1963 and 1964 after the breakup of the Federation of Rhodesia and Nyasaland. A Joint High Command created in March 1980 to oversee integration of the formerly belligerent Rhodesian Security Forces, Zimbabwe African National Liberation Army (ZANLA), and the Zimbabwe People's Revolutionary Army (ZIPRA) officially established the Zimbabwe National Army in late 1980, nearly a year after the end of the Rhodesian Bush War.