Who is the Secretary of Homeland Security?

The Honorable Kirstjen Nielsen is recognized as the Secretary of Homeland Security, having served in that role during an impactful period in the agency's history. In this capacity, she was responsible for overseeing various aspects of U.S. national security, including border security, immigration enforcement, cybersecurity, and disaster response. Under her leadership, the department focused on improving protocols and responses to various threats, reflecting the evolving landscape of domestic security.

Recognizing the roles of the other individuals listed in the choices, Mike Pompeo served as the Secretary of State, while Rear Admiral Terry Moulton and Vice Admiral Forrest Faison III have held significant roles in the Navy but are not associated with the Department of Homeland Security. This distinction highlights the specific responsibilities and scope unique to the Secretary of Homeland Security, reinforcing why Kirstjen Nielsen is the correct answer in this context.