President Obama with cadets after speaking about his Afghanistan policy at the U.S. Military Academy at West Point, N.Y. Julie Jacobson/AP hide caption

itoggle caption Julie Jacobson/AP

(From left) Sen. Russell Feingold (D-WI), Rep. Barbara Lee (D-CA) and Rep. Jim McGovern (D-MA) take part in a news conference on Capitol Hill on Tuesday to discuss President Obama's decision to send more troops to Afghanistan. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

President Lyndon Johnson signs the Tonkin resolution, which gave him power to escalate the Vietnam war. It was easily passed by both houses of Congress, although it was later repealed. MPI/Getty Images hide caption

itoggle caption MPI/Getty Images

Lance Cpl. Chris Garcia and other members of Golf Company cross an irrigation ditch as the 2nd Battalion, 8th Marine Regiment moves into Helmand province in July during a major offensive against the Taliban stronghold in southern Afghanistan. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR