200203-N-EJ843-0042 GROTON, Conn. (Feb. 3, 2020) A Sailor assigned to the military working dog unit at Naval Submarine Base New London helps block off a perimeter during a simulated suspicious package training event in support of exercise Citadel Shield-Solid Curtain 2020. Exercise Citadel Shield-Solid Curtain 2020 is a two-part, force protection exercise that is being conducted nationwide on Navy installations, Feb. 3-14. The annual exercise is not in response to any specific threat, but is used to evaluate the readiness of fleet and installation security programs. (U.S. Navy photo by Mass Communication Specialist Seaman Jimmy Ivy III/Released)