Question: who was the highest ranking officer killed in vietnam
[{'answer': 'Rear Admiral Rembrandt Cecil Robinson', 'provenance': [{'wikipedia_id': '43483964', 'title': 'Harold J. Greene', 'start_paragraph_id': 2, 'start_character': 273, 'end_paragraph_id': 2, 'end_character': 310, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43483964', 'title': 'Harold J. Greene', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 480, 'bleu_score': 0.9754554449993441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14616878629772362636}, 'section': 'Section::::Abstract.'}]}]