Schoolgirls wave Iranian flags during a ceremony to mark the anniversary of the Islamic Revolution at the Behesht-e Zahra (Zahra's paradise) cemetery in southern Tehran on Feb. 1. Morteza Nikoubazl/Reuters
A Muslim woman stands in front of a portrait of Ruhollah Jomeini, leader of the 1979 revolution. DPP/Newscom/File
Iranian President Mahmoud Ahmadinejad visits the family of a revolution martyr in Tehran during the ten-day celebrations marking the anniversary of the 1979 Islamic Revolution in Iran. Sipa/Newscom
A picture taken on Feb. 1, 1979 shows the late Iranian revolutionary leader, Ayatollah Ruhollah Khomeini (c.) getting off an Air France jet upon his arrival in Tehran, following an exile in France. Bells chimed across Iran on February 1, 2010 to mark the anniversary of his return, the trigger for a revolution which spawned an Islamic state now engulfed in a deep political crisis. Gabriel Duval/AFP/Newscom/File
An armed guerrilla soldier guards a queue of Shiite women in Tehran in 1979. AFP/Newscom/File
A female guerrilla soldier holds a rifle in Iran in 1979 during the Islamic Revolution. AFP/Newscom/File
Shah Pahlavi of Iran is seen in an official portrait in 1971. Pahlavi, a pro-Western leader with close ties to the United States, was toppled by the 1979 Islamic revolution led by anti-American clerics. AP/File
Iranian schoolgirls wearing costumes attend a ceremony in Behesht-e-Zahra Cemetery in Tehran on Feb. 1. Iran began on Monday ceremonies to mark the 31st anniversary of the 1979 Islamic Revolution. Ahmad Halabisaz/PTS/Newscom
The Islamic Revolutionary Guard Corps, or Pasdaran, was formed by former Supreme Leader Ayatollah Khomeini in the aftermath of the 1979 Islamic Revolution. It was originally created as a 'people's army,' commanders reporting directly to the supreme leader. Current forces consist of naval, air, and ground components, and roughly 125,000 fighters total. The corps's primary role is internal security, but experts say the force can assist Iran's regular army of some 350,000 soldiers, The guard also controls Iran's Basij Resistance Force, an all-volunteer paramilitary wing. Sipa/Newscom
Iran's all powerful supreme leader Ayatollah Ali Khamenei said on that the 31st anniversary of the Islamic revolution would be a 'punch' to the world's 'arrogant' powers that would stun them to mark the occasion when, 31 years ago, the Iranian air force gave its support to the revolutionary leader Ayatollah Ruhollah Khomeini. Sipa/Newscom
Followers of Dr. Shapour Bakhtiar are seen demonstrating in London in 1979. A lawyer and pro-democracy advocate and the last Iranian Prime Minister before Islamic revolution, Dr. Bakhtiar had been one of the leaders of the liberal opposition to the late Shah's dictatorship. Ayatollah Khomeini, the revolutionary leader of Iran's popular movement, who advocated a theocracy, dismissed Bakhtiar's effort to establish democratic rule and called upon the people to rebel against his government. Bakhtiar was forced to flee to France, where he was assassinated, along with his personal secretary, Sorush Katibeh, in a house located in a small town in the outskirts of Paris. The assassins were reported to be members of Iran's Revolutionary Guards Corps. Zuma/Newscom/File
The Shah's army is seen marching through Tehran before he was overthrown by the Iranian revolution in 1979. Sipa/Newscom/File
Women are seen in Tehran after the 1979 Islamic Revolution. AFP/Newscom/File
Hezbollah fighters fired antitank missiles at a convoy, killing two Israeli soldiers. The much-anticipated reply to an Israeli strike 10 days before showed the challenge both sides face: retaliation without escalation.
The Lebanese militant group Hezbollah has launched its most severe attack on Israeli forces since 2006, when a cross-border incident set off a summer war. Wednesday's strike drew Israeli retaliation, but analysts suggested both sides were aiming for restraint.