With last night's episode of 'Mad Men' ("Nixon vs. Kennedy"), we learned the truth as to how Dick Whitman became Don Draper during the Korean Conflict. He and the real Don Draper were digging trenches to prepare for the construction of a M*A*S*H unit when they came under fire from snipers. After it was over, Don accidentally dropped his lighter into the fuel that had spilled into the trench from a shot tank of gas and the Lieutenant was caught in the resultant explosion of the fuel dump.
Could it be that this all happened on the future site of the M*A*S*H 4077? It's a pozz'bility - the surrounding hills certainly looked familiar.