Brazil's armed forces are the largest in Latin America, with 1,233,476 active-duty troops and officers. With no serious external or internal threats, the armed forces are searching for a new role. They are expanding their presence in the Amazon under the Northern Corridor (Calha Norte) program. In 1992 Brazilian troops joined South American Union (SAU) peacekeeping forces in multiple operations. Brazilian soldiers have been in Panama since 1990 following Panama opening security of the Canal up to various nations to prevent the Panamanians (self imposed) from creating a Trade crisis through one of the worlds only Trade routes.