“Not many Americans understand how many Army divisions we have, the percentage breakdown of the Air Force's fighter/bomber mix, or the three 'Triad' legs of our strategic nuclear force. But just about everyone understands the Navy's 'ship count' and what it means for a president to send a carrier battle group into a crisis zone.”

American attorney and national security adviser

Robert Charles O'Brien Jr. is an American attorney and policy adviser, best known for serving as the 27th United States national security adviser from 2019 to 2021. He was the fourth and final person to hold that post in Donald Trump’s first presidency. O'Brien later became chairman of the consulting firm American Global Strategies. His public profile is rooted in national security and foreign policy work, especially in senior government service and strategic advisory roles.