The formal announcement of the formation of the Chushi Gangdrug (Land of Four Rivers and Six Ranges) Defend Tibet Volunteer Force was made on the 16th of June 1958 and since then it is commemorated every year to mark the anniversary of Chushi Gangdrug. It was the first time that all the regions of Kham and the Khampas of all regions came together under one organization and fought under one banner since the splitting up of Tibet during the reign of the last and evil King, Lang Tharma.