Story highlights Defense Secretary Ash Carter continued to occasionally use a personal account for official business through September

The issue of email practices became controversial a year ago

Washington (CNN) Emails released by the Pentagon late Friday show Defense Secretary Ash Carter continued to occasionally use a personal account for official business through September, months after controversy erupted over Hillary Clinton's email use while leading the State Department.

Some 1,336 pages of emails from his use of email on an iPhone and tablet were released to CNN and other news organizations pursuant to a Freedom of Information Act request. Many of the emails had redacted information. Some showed him talking with aides about various matters, including press requests, while others included him exchanging messages with friends or acquaintances, including several with Facebook Chief Operating Officer Sheryl Sandberg.

Carter has said he never used personal devices to transmit classified information.

A couple of the emails just released were marked "for official use only," which means the material is considered sensitive but is not deemed classified.

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