The Transportation Security Administration is part of the U.S. Department of Homeland Security that has authority over the safety of the traveling public in the United States. It was created as a response to the September 11 attacks. TSA has nearly 50,000 security officers, inspectors, air marshals and managers who protect the nation’s transportation systems by screening for explosives at airport checkpoints, inspecting rail cars, patrolling subways with law enforcement partners, and working to make all modes of transportation safe. More than 2 million passengers are screened every day by a highly trained TSA workforce to ensure the security of the traveling public. Transportation Security Officers conduct security screening of passengers, baggage and cargo at airports to prevent any deadly or dangerous objects from being transported onto an aircraft.