If North Korea launches another artillery strike against South Korea--or simply hurls itself at the 38th parallel--the resulting confrontation could trigger one of the largest population movements in human history. According to one account, 140,000 U.S. government noncombatants and American citizens would look to the U.S. government for a way out. And that's just the Americans. Hundreds of thousands of South Korean citizens and other foreign nationals would be clamoring for any way off of the wintery, dangerous peninsula.
In the absolute worst case, tens of millions of South Koreans and hundreds of thousands of foreigners, some wounded, some suffering from chemical, biological or even radiological hazards, will flee in the only direction available to them: south. The country's transportation system would be in nationwide gridlock as panicked civilians avail themselves of any accessible means of travel. In this desperation and chaos, the U.S. military has the unenviable mission of supporting and evacuating U.S. citizens, all while waging a fierce battle along the DMZ.
The U.S. does have a plan. In the event of an evacuation, the State Department and U.S. military say that the U.S. will instigate a prepared noncombatant evacuation operation. The first stop for an evacuee would be a prearranged assembly area for registration, a search, and an identity check. Then, assuming transportation is available, evacuees would be sent by whatever means the military can arrange to relocation centers farther down the peninsula to wait for transportation out of South Korea. Finally, U.S. civilians would gather at evacuation points where they will leave by sea or air to foreign "safe havens," such as Japan, or to the United States. The plan openly admits that things won't go smoothly, even instructing civilians to surrender their personal vehicle to the U.S. military upon arrival to an assembly area because the U.S. military may, in desperation, turn to civilian transport.
On paper, everything looks good, but as Korean tensions increase, the U.S. will have to get serious about evacuation planning. A successful wartime evacuation of the Korean peninsula can be done, and has been before. Sixty years ago this month, as Chinese troops pushed United Nations forces back from the Chinese border, an international fleet of 193 ships rescued around 196,000 soldiers and Korean refugees from Hungnam over just two weeks. However, modern-day evacuees would be far slower and more cumbersome than the well-trained amphibious force that made the Hungnam operation possible. Instead, the evacuation will be more like Dunkirk, where, largely unbidden, a disorganized fleet raced into threatened, shattered harbors to pull whomever they could to safety.
Countries around the globe with civilians or officials in South Korea would look to the U.S. first for evacuation support. But with a war to fight; wounded, contaminated, or infectious casualties to deal with; and amphibious lift resources at a premium, there would not be enough space for all who wish to leave.