On the list of U.S. military priorities, Africa has always ranked right smack at the bottom. Now that appears to be changing. As Eric Schmitt recently reported in the New York Times, "thousands of soldiers once bound for Iraq or Afghanistan are now gearing up for missions in Africa." Before the gearing up proceeds much further, Americans might want to ask a few questions. Chief among them are these: Why the sudden shift in priorities? What's the aim? Who stands to benefit? What risks does the militarization of U.S. policy in Africa entail?

Among the various services, the U.S. Army in particular finds the prospect of an expanded Africa presence appealing. As Schmitt observed, with U.S. forces out of Iraq and soon scheduled to leave Afghanistan, "the Army is looking for new missions around the world." For Army leaders, Africa spells opportunity, a chance to demonstrate continuing relevance at a time when the nation's appetite for sending U.S. troops to invade and occupy countries has pretty much evaporated.

Thus, we have U.S. Army Africa, or USARAF, the latest in the Pentagon's ever-growing roster of military headquarters. The mission of this command, which describes itself as "America's premier Army team dedicated to positive change in Africa," manages to be at once reassuringly bland and ominously ambitious. On the one hand, USARAF "strengthens the land force capabilities of African states and regional organizations." On the other, it "conducts decisive action in order to establish a secure environment and protect the national security interests of the United States."...