Question: The Advanced Tactical Fighter (ATF) was a demonstration and validation program undertaken by the United States Air Force, including the Soviet Sukhoi Su-27, a twin-engine supermaneuverable fighter aircraft designed by Sukhoi, it was designed to complement which aircraft?
{'answer': 'Mikoyan MiG-29', 'supporting_facts': [['Advanced Tactical Fighter', 0], ['Sukhoi Su-27', 3]]}