Agentic AI cyberweapons are rapidly becoming the tool of choice for state-sponsored attackers targeting U.S. critical infrastructure. By autonomously conducting reconnaissance, modifying system settings, and adapting to new environments, these tools exponentially accelerate the pace of cyber combat. If urgent action is not taken to equip infrastructure operators with strong AI defenses, malign actors will remain free to exploit vulnerabilites in U.S. infrastructure to prey on U.S. citizens, intercept sensitive intelligence, and disrupt vital national functions.