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WASHINGTON — President Obama has chosen Vice Admiral Michael Rogers to be the next director of the National Security Agency and head of U.S. cyber command, according to a senior defense official.

The official asked not to be identified because the president has yet to make the announcement.

The pick of Rogers comes at delicate moment for the NSA, which has faced congressional and public scrutiny in the aftermath of revelations by former contractor Edward Snowden about the agency's surveillance methods.

Rogers will succeed Gen. Keith Alexander, who has served as NSA director since 2005. He later took on a dual-hatted position as chief of U.S. Cyber Command in 2010. The White House previously announced that Alexander would step down in March.

The White House would not confirm the appointment.

Rogers, who is trained as a cryptologist, is a 30 year Navy veteran. He currently runs the Navy's cyber warfare arm.

His appointment was reported for by the Los Angeles Times.