The Information Warfare Aggressor role is similar to the "tiger teams" commercial firms hire (and the air force pioneered) to test the defenses of corporate networks. The two aggressor squadrons have increased the quality and quantity of attacks that can be launched against U.S. systems, to see how well the defenses hold up. Members of the squadron then analyze the results of their attack. Finally, the aggressor hackers tell the sysadmins and other concerned personnel of the target unit what they did wrong, and why.
