Question: when was the sergeant major of the army established
[{'answer': '1966', 'provenance': [{'wikipedia_id': '563150', 'title': 'Sergeant Major of the Army', 'start_paragraph_id': 6, 'start_character': 196, 'end_paragraph_id': 6, 'end_character': 200, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '563150', 'title': 'Sergeant Major of the Army', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 704, 'bleu_score': 0.9826823455989031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15812145861511927054}, 'section': 'Section::::History.\n'}]}]