Question: what is a e8 in the marine corps
[{'answer': 'Master sergeant', 'provenance': [{'wikipedia_id': '6738858', 'title': 'United States Marine Corps rank insignia', 'start_paragraph_id': 7, 'start_character': 377, 'end_paragraph_id': 7, 'end_character': 392, 'bleu_score': 1.0, 'section': 'Section::::Enlisted.\n'}]}, {'answer': 'First sergeant', 'provenance': [{'wikipedia_id': '6738858', 'title': 'United States Marine Corps rank insignia', 'start_paragraph_id': 7, 'start_character': 396, 'end_paragraph_id': 7, 'end_character': 410, 'bleu_score': 1.0, 'section': 'Section::::Enlisted.\n'}]}, {'provenance': [{'wikipedia_id': '6738858', 'title': 'United States Marine Corps rank insignia', 'section': 'Section::::Enlisted.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['Master Sergeant or First Sergeant. The First Sergeant and Sergeant Major ranks are command-oriented Senior Enlisted Advisors, with Marines of these ranks serving as the senior enlisted Marines in a unit,', 'Master Sergeant or First Sergeant. The First Sergeant and Sergeant Major ranks are command-oriented Senior Enlisted Advisors, with Marines of these ranks serving as the senior enlisted Marines in a unit, charged to assist the commanding officer in matters of discipline, administration, and the morale and welfare of the unit.', 'administration']}}]}]