The U.S. Army’s annual unconventional warfare exercise Robin Sage is set to kick off across rural North and South Carolina this month, pitting Special Forces candidates against simulated guerillas fighting for the fictional nation of “Pineland.” The exercise is so realistic and spans such a large area that the U.S. Army has issued notices to local law enforcement agencies warning them not to mistake the exercise for a real insurrection, an error that has cost one soldier his life during a previous Robin Sage event. Robin Sage is conducted annually by the U.S. Army John F. Kennedy Special Warfare Center...