South Korea and the United States will hold an annual joint military exercise for 11 days later this month to strengthen their combined defensive posture, the countries announced Friday, as North Korea continues to develop ballistic missiles.The Freedom Shield exercise is scheduled to take place between March 13 and 23 without a break, according to South Korea's Joint Chiefs of Staff and U.S. Forces Korea."Freedom Shield is designed to strengthen defense and response capabilities of the alliance by focusing within the exercise scenario on things such as, the changing security environment, D…READ FULL ARTICLE