A former NASA employee in Ohio has pleaded guilty to illegally shipping night-vision rifle scope equipment to South Korean companies.

Sixty-six-year-old Kue Sang Chun of Avon Lake entered the plea today to two counts in Cleveland federal court. Sentencing is scheduled April 14.

He admitted exporting defense items on the U.S. munitions list without federal approval. He also admitted making a false individual income tax return.

The Korean-born U.S. citizen is a former employee at the NASA Glenn Research Center in Cleveland. Authorities say he wasn’t accused of taking technology from the center.

Chun could face up to 13 years in prison but under federal sentencing rules will likely receive a shorter sentence.