Final answer:
Yes, Green Berets do need to learn foreign languages as it is essential for their special missions. Language skills are key to effective communication and building alliances in foreign territories.
Step-by-step explanation:
It is true that Green Berets, who are members of the US Army Special Forces, need to learn and understand foreign languages. This capability is crucial for carrying out their missions, especially when they are deployed overseas. By communicating effectively in the local languages, they are better positioned to work with local populations, gather intelligence, and conduct negotiations. The language skills also help them in building relationships with native allies, similar to how recruiting native allies was vital in historical events like the Spanish conquest of the Aztec.