sentences:  Highlighting the DR Congo's importance to United States national security, the effort to establish an elite Congolese unit is the latest push by the U.S. to professionalize armed forces in this strategically important region.There are economic and strategic incentives to bring more security to the Congo, which is rich in natural resources such as cobalt, a strategic and critical metal used in many industrial and military applications.The largest use of cobalt is in superalloys, used to make jet engine parts.