The answer is simple: 9/11. The most costly terrorist attack ever was carried out from Afghanistan. The United States showed bipartisan determination to bring the perpetrators to justice and—the part that explains our continuing engagement in Afghanistan—to prevent its soil from ever being used again to stage terrorist attacks.

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Pundits tend to treat terrorism and guerrilla tactics as something new, but nothing could be further from the truth. Although the agendas have changed over the years -- from tribalism, to liberalism and nationalism, to socialism, to jihadist extremism -- guerrilla and terrorist warfare has been ubiquitous throughout history and consistently deadly.

As the Pentagon attempts to refocus the U.S. military strategy toward Asia, the department is facing major budget constraints. Experts disagree on how to balance the fiscal challenge with the country's national security priorities.

"The prospect of American skies swarming with drones raises more than just safety concerns. It alarms privacy advocates as well. Infrared and radio-band sensors used by the military can peer through clouds and foliage and can even detect people inside buildings."

Micah Zenko argues, "routine and unchallenged assertions highlight what is perhaps the most widely agreed-upon conventional wisdom in U.S. foreign and national security policymaking: the inherent power of signaling."

People love to talk about "red lines" for all sorts of challenges, and the Iranian nuclear program is no exception. The United States can, in principle, threaten stronger sanctions if Iran crosses certain red lines. It can threaten military action if Iran crosses others. But it's not clear that setting red lines—particularly in public, where failing to follow through on threats can be costly—is a productive course.

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"The U.S., by what it does and how it does it, ought to set and reinforce a norm that the use of armed drones should be exceptional," argues Richard N. Haass.

Carla Anne Robbins says, "The drone war isn't going away. As the U.S. slashes budgets, the lethality and cost-effectiveness of drone strikes will likely make them an even more attractive option. But that doesn't mean the current policy is wise or even sustainable."

As the 113th U.S. Congress considers an overhaul of the country's immigration system, Task Force members Richard Land, Eliseo Medina, and project director Edward Alden discuss U.S. policy options and political prospects for comprehensive change.

As the 113th U.S. Congress considers an overhaul of the country's immigration system, Task Force members Richard Land, Eliseo Medina, and project director Edward Alden discuss U.S. policy options and political prospects for comprehensive change.

Fawzia Koofi, Afghan Member of Parliament, women's rights activist, and presidential candidate, speaks about what to expect for Afghanistan after U.S. troops withdraw in 2014.

Micah Zenko says, "Military officials increasingly believe that the Obama administration must think through its current practices and policies of targeted killings, and consider how they can be reformed, or risk others following in U.S. footsteps."

Iran's reluctance to negotiate over its controversial nuclear program makes a deal with international powers unlikely, says CFR's Carla Robbins.

Secretary of Defense Leon Panetta and Joint Chief of Staff General Martin E. Dempsey testified before the Senate Foreign Relations Committee on February 7, 2013, about the September attacks on the U.S. Embassy in Benghazi, Libya and the response of the Defense Department. Panetta's and Dempsey's prepared remarks and video of the hearing are available on the Committee's website.

Micah Zenko says, "Most analysts and journalists have focused on President Obama's expanded scope, intensity, and institutionalization of targeted killings against suspected terrorists and militants. However, perhaps the enduring legacy of the Obama administration will be its sustained, rigorous effort to shape and define-down the idea of war."

The BCA established an automatic process to reduce spending, partially entailing a sequester of budgetary resources, if Congress did not pass and the President did not sign, by January 15, 2012, legislation reducing the deficit by $1.2 trillion over the FY2012-FY2021 period. No such legislation was enacted by the deadline. Therefore, the automatic spending reduction process was triggered.

Throughout Chuck Hagel's marathon confirmation hearing, America's decade-long war in Afghanistan was noticeably overlooked. But it is curious to see the next secretary of defense receive so few inquiries from senators about the war whose end he will presumably oversee in the coming years, says Gayle Tzemach Lemmon.

Adam Segal says the recent Chinese cyberattacks on Bloomberg and the New York Times highlights both the willingness of Beijing to shape the narrative about China, as well as the vulnerability the top leadership feels about how they are portrayed.

"Homegrown violent jihadist activity since 9/11 defies easy categorization. No workable general profile of domestic violent jihadists exists."

With the recent revelation of a United Nations inquiry into U.S. drone strikes policies and practices, Micah Zenko says the UN has actually been investigating U.S. drones for ten years—but to no effect.