In the past decade, the U.S. military’s interest in human enhancement technologies has waxed and waned. An initial surge of interest, fueled by a desire to create the “Future Force Warrior” has given way, over time, to the more mundane challenges of meeting the needs of soldiers in Afghanistan and Iraq. We would be fooling ourselves, however, if we believed that the U.S. military had abandoned efforts to upgrade the soldier’s body and mind to match the pace of modern warfare. We are in, at best, a lull in military investments in human enhancement research. That is why now is good time to start asking hard questions about how—and indeed if—we should proceed along this course.
In 2002, Dr Joseph Bielitzki, chair of DARPA’s Defense Sciences Office, announced a grand program to improve soldiers, with the slogan “Be all that you can be, and a lot more.” His targets: sleep, fatigue, pain, and blood loss. Other projects studied psychological stress, memory, and learning. The next year, the Army launched the multibillion dollar Future Combat System to transform the military into...