Ramstein for example also provides a non-combat zone place for major medical care for the wounded from combat zone. Survival rates are highest when there is close medical like in the Ramstein area. We need the stuff we know we will need (like bullets, bombs, trucks, tanks etc) positioned close to where the contingency plans say they might be needed. Diego Garcia in the Indian Ocean is such an example. The less we pre-position the more heavy airlift assets (e.g. C-17) we need.