Petraeus takes up new post as CIA director

Vice President Joe Biden swore in now-retired Gen. David Petraeus as director of the CIA in a private ceremony on Tuesday, officially marking the four-star general's transition into a career with a far lower profile than his battlefield commands in Iraq and Afghanistan.

Petraeus, whose latest post was commander of the U.S.-led coalition in Afghanistan, retired from the Army last week after a 37-year military career. He was also one of the architects of the 2007 "surge" in Iraq.

Petraeus is no stranger to the CIA: During his time as commander in both Iraq and Afghanistan, he worked to improve the historically tense relationship between the intelligence agency and the military's elite special operations forces. Coordination between the two has been widely credited with enabling the successful covert U.S. raid that killed Osama bin Laden in Pakistan.

Petraeus takes over the helm of the CIA from Leon Panetta, who has already begun his new job as Defense secretary.