CBS) U.S. forces are about to get some much-needed help as they fight the Taliban in Afghanistan, reports CBS News chief foreign affairs correspondent Lara Logan in an exclusive report. The Colombian commandos are U.S. trained and battle-tested from having defeated terrorists in their own country. Ten years ago, they didn't even exist. Today, elite Colombian Special Operations troops are preparing to fight alongside the U.S. in Afghanistan, reports CBS News chief foreign affairs correspondent Lara Logan.