The U.S. Navy lieutenant who apologized on video for “a mistake” while he and his crew were being held by Iranian captors in January is appealing his discipline for violating the service’s code of conduct, The Navy Times reported.

Lt. David Nartker was given a non-judicial punishment last week by the Navy Expeditionary Combat Command, two officials familiar with the proceeding told The Times. Narker appeared before Rear Adm. Frank Morneau on Aug. 4 to hear the charges against him, Stars and Stripes reported.

The exact punishment given to Nartker and the charges leveled against him have not yet been revealed. Stars and Stripes reported the punishments could range from confinement to his quarters to a letter of reprimand – which could be a career-ender.

Nartker was the most senior officer of 10 sailors manning a pair of boats captured by Iran after the U.S. vessels accidentally strayed into Iranian waters on Jan. 12. He was filmed apologizing for the incursion on a video that was later released by Iran.

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