Map 12 of Maps of SEA in the 1960s

Route 12 led west from the Dog House.  The road intersected Route 8 from Nape Pass and continued to Thakhek on the Laotian bank of the Mekong River .  Route 12 was important for two reasons:

Route 12 linked traffic from the Nape Pass with routes leading toward South Vietnam .

Route 12 carried westbound traffic.

Westbound traffic did not threaten American forces in South Vietnam .  The westbound supplies, however, were important in the ongoing war between the Communist Pathet Lao and the Royal Laotian forces.  The North Vietnamese controlled all but the last 15 miles of Route 12.   The road would be important if the Communists ever decided to fight their way to the Mekong River .  Since the American aircraft based at NKP were less than 10 miles from the western end of Route 12, the FACs regularly watched Route 12.