A photo released by the U.S. Navy shows the guided-missile cruiser USS Philippine Sea launching a Tomahawk cruise missile against Islamic State targets in Syria on Tuesday. Eric Garst/U.S. Navy/EPA/Landov hide caption

itoggle caption Eric Garst/U.S. Navy/EPA/Landov

Syrian refugees stand in line for food at Kawergost refugee camp in Irbil, Iraq, on Aug. 21. The Syrian civil war has already sparked a refugee crisis in the region. Now, many countries are waiting to see the effects of a possible U.S. military strike. Hadi Mizban/AP hide caption

itoggle caption Hadi Mizban/AP

Jordanian protesters chant slogans against corruption during a March 15 anti-government demonstration in Amman. Jordanians have held Arab Spring-inspired protests since 2011, demanding political reforms and anti-corruption measures. The protests have been peaceful. Khalil Mazraawi/AFP/Getty Images hide caption

itoggle caption Khalil Mazraawi/AFP/Getty Images

To date, Syrian rebels have had to rely on small-scale weapons in their fight against the Syrian army. Here, a rebel fighter throws an explosive device toward a Syrian government position in the northern city of Aleppo last month. John Cantlie/AFP/Getty Images hide caption

itoggle caption John Cantlie/AFP/Getty Images