 Complete the following phrase:  The history of the Portuguese commandos began on 25 June, 1962, when, in Zemba Northern Angola, the first six groups of those that would be the predecessors of the commandos, were formed. For the preparation of these groups, the CI 21  Centro de Instrução de Contraguerrilha Counter-Guerrilla Instruction Centre was created, commanded by Lieutet-Colonel Nave, and had as instructor, the photographer and former French Foreign Legion Sergeant, the Italian Dante Vachi, with experience in the 