BOSTON (Reuters) - A South Korean man was sentenced to nearly three years in prison on Tuesday for his role in a scheme to buy military engines for Black Hawk helicopters and then divert them to China. Kwonhwan Park and his Malaysian company, SGS, claimed that the two engines were either for the Malaysian Army or the South Korean Army in an application to the State Department but the shipment actually was sent to China from Malaysia. U.S. District Judge Mark Kravitz ordered Park, who pleaded guilty to violating the Arms Export Control Act and conspiracy charges in November, to...