Question: what branch of the military do the green berets belong to
[{'answer': 'Army', 'provenance': [{'wikipedia_id': '320247', 'title': 'United States Army Special Forces', 'start_paragraph_id': 0, 'start_character': 14, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]