A Free Syrian Army fighter looks through the scope of his sniper rifle at an area controlled by forces loyal to President Bashar Assad in Aleppo. Reuters/Landov hide caption

itoggle caption Reuters/Landov

In Washington, D.C., this week, there have been demonstrations both in favor of and against a military strike on targets in Syria. Outside the White House on Monday, supporters of Syrian President Bashar Assad waved a Syrian flag with his face on it. Jewel Samad/AFP/Getty Images hide caption

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A Free Syrian Army fighter in eastern Syria on Wednesday. /Reuters/Landov hide caption

itoggle caption /Reuters/Landov

Members of the U.S. Marine Corps listen to President Obama during his visit to Camp Pendleton, Calif., in August. Kevork Djansezian/Getty Images hide caption

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Secretary of State John Kerry on Tuesday as he testified before the House Armed Services Committee. Chip Somodevilla/Getty Images hide caption

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In Washington, D.C., this week, there have been demonstrations both in favor of and against a military strike on targets in Syria. Outside the White House on Monday, supporters of Syrian President Bashar Assad waved a Syrian flag with his face on it. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

Syrian Foreign Minister Walid al-Moualem (left) and Russian Foreign Minister Sergey Lavrov in Moscow on Monday. Yuri Kadobnov /AFP/Getty Images hide caption

itoggle caption Yuri Kadobnov /AFP/Getty Images

Samantha Power, the U.S. ambassador to the U.N., called military action in Syria legitimate and necessary. Emmanuel Dunand /AFP/Getty Images hide caption

itoggle caption Emmanuel Dunand /AFP/Getty Images

President Obama on Friday at the G-20 Summit in St. Petersburg, Russia. Kevin Lamarque /Reuters/Landov hide caption

itoggle caption Kevin Lamarque /Reuters/Landov

A U.S. Navy F/A-18F Super Hornet prepares to launch from the aircraft carrier USS Nimitz earlier this week in the Red Sea. The ship is among U.S. military assets in the region. Nathan R. McDonald /UPI/Landov hide caption

itoggle caption Nathan R. McDonald /UPI/Landov

As Secretary of State John Kerry spoke to the House Foreign Affairs Committee on Wednesday, "Code Pink" protesters behind him held up "bloody hands" to express their opposition to the prospect of U.S. military strikes on Syria. Jim Watson /AFP/Getty Images hide caption

itoggle caption Jim Watson /AFP/Getty Images