新战略威胁时代下的国土防御.pdf

1ATLANTIC COUNCILJuly 2025IntroductionThreats to the US homeland have funda-mentally changed from two decades ago.In the years following 9/11,the most pressing dangers came from terrorist groups intent on carrying out attacks on US soil.Todays threat landscape is broader and more com-plex.Peer-state competitors,transnational criminal organizations,and non-state ac-tors now possess the means to target the US homeland through a range of kinetic and non-kinetic capabilities.These include long-range missiles,cyberattacks,sabo-tage,disinformation,and malign foreign influenceall tools designed to disrupt cri-tical infrastructure,weaken public trust,and undermine the ability of the United States to project power abroad.The traditional model of homeland defense has relied on a layered approach of projec-Issue brief The border and beyond:Homeland defense in an era of new strategic threatsFrom launching cyberattacks to targeting critical infrastructure,US rivals are bringing the fight closer to home.Defending against these threats will require not just military might,but smarter defense planning,greater resilience,and military modernization.Clementine Starling-Daniels and Amy CowleyBottom li