WASHINGTON - Hundreds of available trucks, boats, planes and federal officers were unused in search and rescue efforts immediately after Hurricane Katrina hit because FEMA failed to give them missions, new documents show. Additionally, the Federal Emergency Management Agency called off its search and rescue operations in Louisiana three days after the Aug. 29 storm because of security issues, according to an internal FEMA e-mail given to Senate investigators. The documents, released by the Senate Homeland Security and Governmental Affairs Committee, are further evidence of lapses in FEMA's response to Katrina. They also detail breakdowns in carrying out the National...