 Complete the following phrase:  In the army, he distinguished himself as a polyglot with full understanding of many local and regional languages and dialects. His linguistic skills were very useful for the military and were always in high demand. He moved around Portuguese Guinea, which was being subjected to an intense guerrilla war instigated by foreign countries, integrated in many missions and operations and working on this capacity. Soon he would start to have a full understanding of the tactical aspects of guerrilla war and counterinsurgency operations and would master them. So he enrolled in special operations training courses and graduated as a commando. In the following years, Marcelino da Mata became known for his many acts of bravery and heroism during the 