Petty Officer 1st Class Tim Glasure, from Coast Guard Station Niagara, N.Y., gives signals to his law enforcement team about what he sees through a door during an active shooter exercise held at Coast Guard Sector Buffalo, N.Y., Jan. 29, 2015. Glasure was was one of many Coast Guard law enforcement officers from Coast Guard stations throughout Sector Buffalo's area of responsibility who participated in the exercise. (U.S. Coast Guard photo by Petty Officer 3rd Class Lauren Laughlin)