An anti-war protestor attends a demonstration outside the White House in Washington D.C., the United States, Dec. 16, 2010. US President Barack Obama on Thursday said the United States is on track to achieve its goals in Afghanistan, but the achievements made there are "fragile and reversible." [Xinhua]

 Anti-war protestors attend a demonstration outside the White House in Washington D.C., the United States, Dec. 16, 2010. US President Barack Obama on Thursday said the United States is on track to achieve its goals in Afghanistan, but the achievements made there are "fragile and reversible." [Xinhua]