South Korean President Park Geun-hye postponed her trip to the United States because of a public health emergency at home. Unfortunately, the delay won't make a future Park trip any more useful.
There is much on which the two nations should cooperate. But the military alliance is outdated. Despite having surged past the North, enjoying a 40-to-1 economic advantage and 2-to-1 population edge, Seoul continues to play the helpless dependent, unable even to command its own forces in a war.
The military relationship was forged in a different time, growing out of World War II. After the Korean War only Washington's security guarantee kept the South independent.