Pre-paid supplies
Pre-paid supplies is a strategic studies
Strategic studies
Strategic studies is an interdisciplinary academic field devoted to topics concerning the relationship between politics, geography and natural resources, economics, and military power, such as the role of intelligence, diplomacy and threats in the preparation and use of force...

term for those military supplies purchased prior to conflict. As a result they do not enter into the current cost considerations of conducting combat.

Conflicts of high intensity and lengthy duration may have to rely mostly on supplies that are produced while they are ongoing. The First and Second World Wars provide examples of this. But smaller wars of shorter duration where belligerents have already stockpiled sufficiently for the outbreak of conflict are able to rely on pre-existing supplies. The U.S. invasions of Grenada in 1983 or Panama in 1989, in particular, were small enough to be almost wholly reliant on existing stocks.
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