An health official wearing protective gear culls a bird at a poultry farm after a naturally occurring bird flu virus was detected near Agartala, India, in January. Sushanta Das/AP hide caption

itoggle caption Sushanta Das/AP

The latest violence in Afghan has raised doubts about the U.S. strategy. Here, Afghan demonstrators shout anti-U.S. slogans as they carry a wounded man during a protest in the Western city of Herat on Feb. 24. Aref Karimi /AFP/Getty Images hide caption

itoggle caption Aref Karimi /AFP/Getty Images

An Iraqi jet fired missiles that hit the USS Stark in the Persian Gulf in 1987, killing 37 U.S. sailors. Iraq and Iran were at war at the time, and the U.S. wanted to keep open the regiion's vital oil shipping lanes. The current friction between the U.S. and Iran has again raised tension in the Gulf. U.S Navy/AP hide caption

itoggle caption U.S Navy/AP

Mohamed El filali, of the Islamic Center of Passaic County, gathers with Muslim students and community leaders in Newark on Friday to address the monitoring of New Jersey Muslims by the NYPD. Spencer Platt/Getty Images hide caption

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U.S. Brig. Gen. Kevin Bergner speaks in Baghdad in July 2007 near a poster of Ali Musa Daqduq. Daqduq was captured in Iraq in March 2007, and is accused of orchestrating the killings of five U.S. soldiers. The U.S. left Daqduq in Iraqi custody when U.S. troops formally withdrew in December. But the Obama administration is seeking to try him before a military commission. Wsthiq Khuzaie/AP hide caption

itoggle caption Wsthiq Khuzaie/AP

The U.S. has taken very different approaches to authoritarian rulers in recent years. President Obama has called for the ouster of Syrian President Bashar Assad, shown here in Damascus on Jan. 11, but has resisted calls for the use of U.S. military force against the Syrian regime. STR/AFP/Getty Images hide caption

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Iran's state-run Press TV showed images of Iranian President Mahmoud Ahmadinejad touring Tehran's research reactor on Wednesday. AFP/Getty Images hide caption

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Staff members use computers at a press center in Beijing. Security experts say hacking of U.S. computers from China is becoming an increasing problem. Greg Baker/AP hide caption

itoggle caption Greg Baker/AP