Summary: As Egyptians take to the streets to call for the ouster of President Hosni Mubarak, some analysts caution about the prospect of protests in Egypt spreading across the Arab world, with popular revolt erupting in Middle Eastern countries such as Yemen, Jordan, Syria, and even Saudi Arabia, with grave implications for regional stability and U.S. national security interests. … One-year retrospective: One year ago today, on January 31, 2010, Aubrey Immelman reported that U.S. Special Forces working with Afghan commandos clashed with Afghan troops manning a snow-covered outpost and called in an airstrike, killing four Afghan soldiers in a case of mistaken identity. Separately, an Afghan interpreter killed two U.S. service members at a combat outpost and U.S. soldiers shot and killed an Afghan imam when his car approached a convoy.