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Daring the world's robot builders and visionaries to design autonomous ground vehicles that could traverse the treacherous terrain of the Mojave Desert was not enough for the Defense Advanced Research Projects Agency. Always on the lookout for new ways to solve persistent problems, it is now taking its quest to the streets-the city streets, that is. Dubbing its latest competition Urban Challenge, the agency is enticing the mechanically inclined dreamers of the world with substantial cash awards to develop a driverless vehicle that can master the roads of a metropolis.

The latest version of a widely used commercial communications standard may soon provide U.S. troops with faster, more efficient networking technologies. Designed to greatly improve data throughput rates, the new rule also offers potentially greater operating ranges than current networks. However, the rule faces several challenges from developers before it can be fully approved.

A new network management technology soon may change the ways unattended ground sensors are designed and operated. By focusing on the radio systems that link individual devices, scientists hope to create an intelligent networking architecture that uses the radio's full communications capability both to conserve energy in a passive mode and to provide brief high-bandwidth data streams. Such operational flexibility would allow the development of multisensor devices able to activate a variety of onboard applications from microphones to real-time streaming video to meet intelligence collection needs.

Conversations with computers are usually pretty one-sided: Users may yell obscenities; cursors continue to blink innocuously. But a collaborative effort between the military and industry may one day replace this one-way, futile discourse with systems that understand the user's cognitive state and then respond accordingly. The implications of this capability reach beyond ensuring that warfighters are primed to receive critical information. It could prove to be instrumental to inventing ways of designing new systems and improving military training.

Envision a future filled with millions of wireless nodes connected through a smart network that automatically adjusts to optimize communications performance. Achieving this reality would require developing low-cost devices and mitigating current weaknesses in networking technology. However, when this vision is realized, troops will be able to infiltrate areas devoid of communications infrastructure yet stay in touch with each other and platforms in the battlespace.

An experimental technology soon may allow U.S. Air Force F-22 Raptor pilots to use the fighter's radar as a high-bandwidth communications system. This capability would enable F-22s and other platforms to transmit in near real time imagery and other files too large for rapid dissemination by current datalinks. The application could greatly enhance the U.S. Defense Department's network-centric warfare capabilities by turning tactical aircraft into reconnaissance and surveillance platforms.

Scientists in the U.S. Navy's Office of Naval Research are developing new virtual reality simulations that address the needs of land-based warriors such as U.S. Marines. These simulations seek to reproduce various motions and scenarios as faithfully as battlefield conditions.

A U.S. Army organization has found a way to move badly needed technologies and capabilities to soldiers in Afghanistan and Iraq. It is adapting existing products such as leaf blowers to meet vital requirements in the field, and it is inserting technologies such as advanced sensors directly from military and commercial laboratories to accelerate the evolution of combat capabilities.

The U.S. Air Force is applying lessons learned from current operations about how new warfighter technologies can build the best bridges between the operational, tactical and intelligence elements of warfare and increase information flow. But while putting more information in warfighters' hands increases situational awareness, challenges remain about how to ensure that more data does not overwhelm troops but rather can be transformed into the applicable knowledge warfighters require.

Warfighting technologies are improving the way the maritime branch of the U.S. Defense Department gathers information and intelligence as well as how the sea service uses these technologies to make operational decisions. With fresh initiatives and electronics, personnel on ships and at land-based operations centers will be able to identify changes and irregularities, allowing warfighters to focus on fewer targets and to share communications over a more dispersed area.