A Bridgeport, Connecticut native, Rear Admiral Nunan graduated from the Coast Guard Academy in 1987. Her early sea duty was in the Caribbean, Gulf of Mexico, and the Western Pacific before she became the last commanding officer of the WWII era USCGC IRONWOOD in Kodiak, Alaska, and subsequently the first commanding officer of its state of the art replacement, the 225-foot SPAR.
Ashore, she has held senior positions in two different Cabinet offices:
Military Advisor to the Secretary of Homeland Security and Military Assistant to the Secretary of Transportation. She has been Chief of Staff at the Force Readiness Command, Sector Commander in Honolulu, Hawaii, and Deputy Sector Commander in San Juan, Puerto Rico. Most recently, she commanded the Coast Guard's Ninth District, which encompasses the Great Lakes and Saint Lawrence Seaways region.
Her professional studies range from a Master's Degree in Business Administration from Rensselaer Polytechnic Institute to a Master Merchant Mariner license and fellowship at the Center for Strategic and International Studies, a non-partisan think tank in Washington, DC. She has attended a number of courses on national and international security at Harvard University and the Naval Post Graduate School.
At CG-1, Rear Admiral Nunan oversees personnel management spanning recruitment, duty assignments, and retirees pay and benefits. She is responsible for the Coast Guard's Health, Safety, and Work-Life programs, as well as policies addressing leadership, diversity, and sexual assault. She serves as a member of the Coast Guard Academy Board of Trustees, Diversity and Inclusion Chief, and President of the Coast Guard Mutual Assistance Board. She is responsible for the integration of the human component in the design and acquisition of all new CG systems. She also oversees the Coast Guard Exchange System.