Question: what popular entertainer joined the us army in 1958
[{'answer': 'Elvis Presley', 'provenance': [{'wikipedia_id': '31288337', 'title': "Elvis Presley's Army career", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31288337', 'title': "Elvis Presley's Army career", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 168, 'bleu_score': 0.9383861709333501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1773758309525598236}, 'section': 'Section::::Abstract.'}]}]