Top 10 disruptive technologies for a new era of global instability.

There is growing concern in the Pentagon that the U.S. military is in a technology rut. Even though American technology has been the gold standard for decades, countries like China intend to challenge that lead.

How the nation's military will keep that edge in a rapidly changing and dangerous world is the proverbial 64-million-dollar question. The national security challenges are multiplying: From the crisis in Ukraine, unprecedented turmoil in the Middle East, uncertainty in Pakistan, the drawdown in Afghanistan, unnerving tensions in the South China Sea.

The U.S. military continues to rely on many technologies that, although still dominant, are several decades old. After 13 years of grinding warfare and large-scale counterinsurgency operations, "We're seeing first-hand that the rest of the world has not stood still," said Defense Secretary Chuck Hagel.

Disruptive technologies and destructive weapons used to be accessible only to advanced nations, but are now available to almost anyone, induding terrorist groups. The Pentagon has observed that China and Russia have been trying to dose the technology gap by developing anti-ship, anti-air, counter-space, cyber, electronic warfare and special operations capabilities that appear designed to circumvent traditional U.S. military advantages.

All this suggests that a new wave of innovation is long overdue. "If we don't take these challenges seriously," Hagel cautioned, "our military could arrive in a future combat theater facing an arsenal of advanced, disruptive technologies that thwart our technological advantages, limit our freedom of maneuver and put American lives at risk."

One of the...