Question: when were khakis first introduced in the navy
[{'answer': '1913', 'provenance': [{'wikipedia_id': '3455880', 'title': 'Uniforms of the United States Navy', 'start_paragraph_id': 29, 'start_character': 45, 'end_paragraph_id': 29, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Service uniforms.:Officers and chief petty officers.:Service Khaki.\n'}]}, {'provenance': [{'wikipedia_id': '3455880', 'title': 'Uniforms of the United States Navy', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 321, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 459404271442252180}, 'section': 'Section::::Service uniforms.:Officers and chief petty officers.:Service Khaki.\n'}]}]