Question: what is the meaning of m o s
[{'answer': 'military occupational specialty', 'provenance': [{'wikipedia_id': '644675', 'title': 'United States military occupation code', 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '644675', 'title': 'United States military occupation code', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 487, 'bleu_score': 0.569872171373998, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13038404358979130358}, 'section': 'Section::::Abstract.'}]}]