TAMPA — A raid by the Navy's SEAL Team 6 to kill or capture the leader of ISIS was cancelled this morning after the operations officer helping to plan the mission used the Calibri font in his PowerPoint briefing, sources confirmed.

According to senior defense officials, the briefing at US Central Command began in the usual way, with weary and depressed staff officers clutching their coffee & iPhones while wishing they were someone else.

That's when Lt. Col. Jack Bremen noticed the operations officer was using Calibri font again. Sources say he also wasn’t using the new slide format that was published in the last fragmentary order sent to the staff, FRAGO 95.002 to OPORD 17-13.

Bremen immediately stopped the briefing, yelled at the operations officer in front of his colleagues for several minutes, and then cancelled the briefing and the mission.

"I'm disappointed to be honest," Bremen said, according to witnesses, who described the officer as visibly agitated. "Our process is the most impo…