From suits of armor and shields to city walls and castle moats, passive defenses are as old as warfare itself. Although defenses look much different today, they are still essential. As RAND researchers write in a new report, protecting the force is always relevant.
To deter future major-power conflict, passive defenses can help convince the adversary that its preferred mode of attack is overly risky and unlikely to succeed. And if a major war does occur, then passive defenses can be used to counter the adversary kill chain and minimize the effects of precision weapons.
These findings have several implications for the Pentagon. The Joint Staff, for example, can focus on how passive defense investments might contribute to U.S. war-winning capabilities. U.S. military leaders can also work with allies and partners to share information on passive defense options and develop integrated plans of action.
