"Golf shoes in the Oval Office could have been a clue."

AP's Darlene Superville with the first clue that Sunday wasn't a normal golf day for President Obama.

Come Sunday, Obama headed for the Andrews Air Force Base golf course, as he does on many weekends when the weather is nice. But he only played nine holes, instead of his customary 18, leaving after about three hours. The reporters who accompany him on public outings didn't think anything was amiss and thought the chilly, rainy weather played into the president's decision to leave several hours earlier than usual.

What they didn't know was that Obama was heading back for that final meeting on the bin Laden operation.

In retrospect, there were a few meager clues that something may have been going on. Take the golf shoes in the Oval Office, for example. Photos of Obama walking up the path to his office also showed him with a tense look and clenched jaw.