President Obama forgot to return the salute of a U.S. Marine while boarding Marine One Friday morning, then came back out to shake the Marine’s hand, according to a tweet by CBS News’ Mark Knoller.

The timing was particularly awkward because Marine One was about to whisk Mr. Obama away to Annapolis, Md. to give the commencement speech at the U.S. Naval Academy commissioning of U.S. Navy and Marine Corps officers.

Mr. Obama later chatted with the Marine and gave him another hand shake just for good measure, Mr. Knoller tweeted later.