The single innovation that will truly reshape the modern battlefield in our lifetime is one that nearly every teenager in the U.S. already has in his or her possession—the portable smartphone. The smartphone already yields significant impact on civilian applications, providing personalized information and services at one’s request and linking individuals into communities with shared interests. The smartphone has become so ubiquitous and prominent due to three critical and interrelated factors: connectivity (its ability to connect and link into shared networks), adaptability (its ability have tailored applications users find most appealing or useful), and convergence (its ability to replace a number of single-purpose devices). These three factors also shape how future armies will leverage smartphone technology to gain decisive advantages in tomorrow’s wars.