When defenders assess a network for cyberattacks, the most highly connected components can appear to be the obvious targets.

Modern ground-based air defenses must react to threats that behave very differently in flight. Cruise missiles can approach ...

Light infantry faces a firepower problem. Units need heavy indirect-fire support that can move quickly with them, but ...

Long-endurance drones such as the MQ-9 Reaper have provided militaries with persistent surveillance and strike capabilities ...

Autonomous aircraft can perform well in carefully controlled demonstrations, but real-world aviation presents a much harder ...

Intercepting incoming rockets is only part of the challenge facing modern air-defense systems. During prolonged attacks, the ...

Detecting a drone is becoming more difficult as unmanned aircraft become increasingly autonomous. Many counter-UAS systems look for radio signals exchanged between a drone and its operator, but an ...

Bird strikes may sound like a minor aviation hazard, but a collision at high speed can damage engines, windscreens and other ...

Small drones approaching ships, ports and coastal installations create a difficult defensive problem. They can fly low, ...

Computer vision can help a drone recognize that it is looking at a vehicle, building or person, but recognition is not the ...

Putting more capable satellites into orbit creates opportunities for communications and other space services, but it also ...

Speakers have a basic privacy problem: sound spreads. Play music, an announcement or a conversation aloud, and people nearby ...