160202-N-TI693-055 NAVAL SUPPORT ACTIVITY PANAMA CITY Fla. (Feb. 2, 2016) - Charles Longo, Naval Support Activity Panama City (NSA PC) police training officer and Installation Training Team (ITT), evaluates Charles Helms, a NSA PC police officer, as he approaches the building where an active shooter has taken hostages during an active shooter drill. The active shooter drill is part of nation wide exercise for all Navy installations known as Solid Curtain-Citadel Shield; and is a force protection exercise that enhances the training and readiness of Navy security personnel. U.S. Navy photo by Mass Communication Specialist 2nd Class Fred Gray IV/Released.