Pfc. Trevor Gaston, a Soldier with the 2nd Battalion, 263rd Air Defense Artillery, demonstrates an FIM-92 Stinger Man-Portable Air-Defense System at Bolling Air Force Base April 14, 2010. Air Defense units from South Carolina and Ohio have been on rotating deployments to the National Capitol Region to support homeland defense as part of Operation Noble Eagle. This continued operation began in 2001, just days after--and in response to--the Sept. 11 terrorist attacks.