On the heels of a satellite launch by North Korea that drew international condemnation, the United States and South Korea announced that the two countries would study the possibility of deploying a new missile-defense system on the peninsula. According to a Feb. 7 statement by United States Forces Korea, the two governments will begin "formal consultations" on improving their antimissile posture, specifically the "viability" of fielding a Terminal High-Altitude Area Defense system that would be operated by U.S. soldiers in...