The reason that the time dimension was important was the result of studies in nuclear weapon employment at Fort Sill, Oklahoma, in December 1979. These studies demonstrated that interdiction in the enemy's rear could seriously delay the movements of the rear echelon forces and create "time windows" during which the US would have the tactical advantage. By ensuring that the command structure was aware of the time dimension of the battlefield, they would be better prepared to take advantage of these windows when they occurred.