Washington (CNN) Air Force Gen. Joseph Lengyel called himself out for a uniform-related gaffe Wednesday after discovering that he wore his ribbon rack upside down during President Donald Trump's State of the Union address.

The four-star general and chief of the National Guard was seated alongside the other Joint Chiefs of Staff during Trump's speech Tuesday night but didn't realize he had committed a uniform infraction until photos emerged from the event.

U.S. President Donald Trump (lower, R) waves as he arrives to deliver his second State of the Union address to a joint session of the U.S. Congress in the House Chamber of the U.S. Capitol on Capitol Hill in Washington, U.S. February 5, 2019. REUTERS/Jonathan Ernst

Lengyel then took to social media to acknowledge the mistake.

"Question: What's wrong with this picture? I'll give you a hint...It's why they keep putting eraser on pencils. Answer: The ribbons on my uniform are upside down. Let this be a lesson and don't let it happen to you!" he tweeted.

Question: What's wrong with this picture? I'll give you a hint...It's why they keep putting eraser on pencils.



Answer: The ribbons on my uniform are upside down. Let this be a lesson and don't let it happen to you! pic.twitter.com/yJSstZ4iKj — Gen. Joseph Lengyel (@ChiefNGB) February 6, 2019

Lengyel also posted a longer message on Facebook.

Read More