The U.S. military currently possesses command of the global commons. Command of the commons is analogous to command of the sea, or in Paul Kennedy’s words, it is analogous to “naval mastery.” The “commons,” in the case of the sea and space, are areas that belong to no one state and that provide access to much of the globe. Airspace does technically belong to the countries below it, but there are few countries that can deny their airspace above 15,000 feet to U.S. warplanes. Command does not mean that other states cannot use the commons in peacetime. Nor does it mean that others cannot acquire military assets that can move through or even exploit them when unhindered by the United States. Command means that the United States gets vastly more military use out of the sea, space, and air than do others; that it can credibly threaten to deny their use to others; and that others would lose a military contest for the commons if they attempted to deny them to the United States. Having lost such a contest, they could not mount another effort for a very long time, and the United States would preserve, restore, and consolidate its hold after such a fight. Command of the commons is the key military enabler of the U.S. global power position. It allows the United States to exploit more fully other sources of power, including its own economic and military might as well as the economic and military might of its allies. Command of the commons also helps the United States to weaken its adversaries, by restricting their access to economic, military, and political assistance. Command of the commons has permitted the United States to wage war on short notice even where it has had little permanent military presence. This was true of the 1991 Persian Gulf War, the 1993 intervention in Somalia, and the 2001 action in Afghanistan.

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Posen, Barry R. "Command of the Commons: The Military Foundation of U.S. Hegemony." International Security. Vol. 28, No. 1 (Summer 2003): 5-46. [ 3 quotes ] [ page 8-9 ]