Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Obama to Announce National Security Team Overhaul Officials say Army General David Petraeus will succeed Leon Panetta, who will take over Pentagon job VOA News April 28, 2011 General David Petraeus (file photo) Photo: Reuters General David Petraeus (file photo) U.S. President Barack Obama is set to announce major changes to his national security team Thursday, including the nomination of CIA director Leon Panetta to replace Defense Secretary Robert Gates. Officials say Obama will name Army General David Petraeus, now leading military operations in Afghanistan, to succeed Panetta as spy chief. Veteran diplomat Ryan Crocker is expected to be named the next U.S. ambassador to Afghanistan, and Lieutenant General John Allen is reportedly being tapped to replace Petraeus as Afghanistan commander. Allen is currently the deputy commander of U.S. Central Command. The new team will be responsible for overseeing this year's planned withdrawal of all U.S. troops from Iraq, as well as a reduction of troops in Afghanistan beginning in July. President Obama plans to turn over security responsibility in Afghanistan to the Afghan government by 2014. The proposed changes, which all require Senate confirmation, drew positive reactions in Congress. The chairman of the Senate Foreign Relations Committee, Democrat John Kerry, said the choices of Panetta and Petraeus will "provide important continuity of leadership, policy and philosophy." Kerry said he expects "broad approval and swift confirmations." Gates, who became Defense Secretary in 2006 under President Obama's predecessor, George W. Bush, had said he would leave his post this year. Gates headed the CIA in the early 1990s under Bush's father, George H.W. Bush. If confirmed as his replacement, Panetta would oversee major Pentagon budget cuts. Gates has already come up with $400 billion in cuts to the defense budget for the next 10 years, and President Obama has called for $400 billion more. Panetta has extensive budget experience, serving four years as chairman of the House Budget Committee and later, heading the White House Budget Office under President Bill Clinton. In addition to these changes, President Obama will also have to find a replacement for top U.S. military officer Mike Mullen, who is expected to retire when his term ends in September. .