"The current arrangement was designed to ensure that both organizations complement each other effectively," Hayden said. "That said, in consultation with appropriate agencies, we are looking to ensure we are appropriately postured to address current and future security needs."
Alexander has led the NSA since 2005 and he added the Cyber Command to his duties when that entity was created in 2010 as attacks against U.S. military networks escalated. It is responsible for both offensive and defensive capabilities defending department networks and conducting cyber operations against U.S. enemies.
The NSA has been one of the most secretive of all U.S. intelligence operations. Alexander has vigorously defended its activities as lawful and necessary to detect and disrupt terrorist plots.
Alexander said secrecy about how the programs work was needed "not to hide it from you, it's to hide it from those who walk among you and are trying to kill you."
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Associated Press writer Lolita C. Baldor contributed to this report.
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