Emergency medical technicians attend to a simulated injured visitor, played by a USS Constitution Sailor as a special operations officer stands guard during a joint anti-terrorism training exercise at the Charlestown Navy Yard in Boston Feb. 25, 2014. The exercise, intended to coincide with Solid Curtain-Citadel Shield 2014, was a collaboration between the USS Constitution, National Park Service, Massachusetts State Police, Boston Police Department and Boston Emergency Medical Services.