Virginia State Police Trooper David Creath dons his gas mask aboard ready reserve force fleet ship SS Cape Johnson (T-AK 5075) on the first day of the Hampton Roads full-scale exercise staged off the coast of Joint Base Langley-Eustis, Va., May 17, 2011. The three-day exercise was intended to strengthen anti-terrorism capabilities and test local, state and federal response efforts in maritime, hostage and mass casualty scenarios.