During the Cold War and for a decade afterward, brigades were attached to divisions—three brigades to each. Some were infantry brigades, some were armored brigades, some were air-defense brigades; all included support and logistical troops from the divisions. The Army, after all, was geared to fight along the East-West German border against Soviet and Warsaw Pact armies, which were also organized into divisions. So, the system made some sense. After the Soviet Union collapsed and the Warsaw Pact countries joined NATO, it made no sense. The Army now envisions much smaller-scale warfare. Under the reorganized system, brigades—not divisions—are the basic unit of command. Each brigade is also a self-contained "brigade combat team," with its own "slice" of support—transportation, engineering, military police, etc.—so that it is no longer dependent on the division. As a result, a whole layer of support-and-servicing personnel can be eliminated; a higher percentage of soldiers in the brigade can be combat soldiers. (In traditional Army parlance, the "tooth-to-tail ratio" can be substantially increased.) How much higher? The Army estimates that each brigade can hold the equivalent of an additional battalion's worth of combat troops. There are three to five battalions in a brigade. So, one extra battalion would mean a 20 percent to 30 percent increase in combat power.