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The Army released its "Training for Full Spectrum Operations" field manual in December 2008. A few short months later, work had already begun on revisions. The increasingly complex battlefield is prompting the service to rethink the way it trains for war. Troops can find themselves conducting offensive operations, defending against an attack or carrying out stability operations - building schools, meeting with local tribal leaders to help improve citizens' conditions - all in the course of one day. "It's not specifically that you conduct offense, you conduct defense, then you conduct stability operations," said Lt. Gen. Thomas Miller, commanding general of the First Army, Fort Gillem, Ga. "The approach is that those are always intermingled together … It's just the dynamic nature of the fight."

Unmanned aircraft systems can be used in a variety of contexts. Hobbyists fly them for private use, as they might a model aircraft. E-commerce giant Amazon is exploring the use of drones for rapid product delivery. Drones are also used for humanitarian purposes, surveying damage caused by natural disasters. The versatility of drones entices state and local law enforcement agencies, as well. The U.S. Customs and Border Protection, for example, deployed UAS to help monitor areas that are difficult to traverse along the Mexican and Canadian borders. When drones detect movement in these places, the CBP is able to send human agents equipped to deliver medical assistance. For local law enforcement, however, drone use is often misunderstood. As quickly as police departments find ways to leverage the benefits of unmanned vehicles, public criticism of such operations can shut them down. Along with an investment in technology and crafting good policy, public perception is a critical factor that law enforcement needs to address.

When disaster strikes, agencies spring into action to provide aid, rescue services, medical care and other forms of emergency response. More and more, first responders are looking for help from new technology to improve their ability to save lives. Unmanned aircraft systems (UAS)-commonly known as drones-could become an important innovation for disaster preparedness and relief.