Those of us of a certain age grew up thinking that the first space battles would be between units of astronauts with lasers. However, November of 2023 saw the demonstration of Israel’s cutting-edge missile defense capabilities, when it intercepted a ballistic missile fired by Houthi rebels in Yemen with the Arrow missile defense system. This event highlights the ever-evolving landscape of irregular warfare and the significance of nation-states being prepared to fully use capstone capabilities, which were originally developed to defend against other nation-states, in safeguarding their citizens from irregular threats posed by non-state actors. This demonstrates the dual realities of irregular warfare: nations not only engage in such conflicts to gain strategic advantages over their adversaries, but they must also defend against the same tactics when used against them. For instance, Iran's deployment of proxies equipped with advanced weapons likely demands a conventional, rather than irregular, response.