Virgin Atlantic founder Richard Branson took to Twitter today to denounce as a “terrible mistake” that a Royal Navy helicopter technician was made to change out of uniform before boarding a flight to the United States.

Petty Officer Nicky Howse told The Sun newspaper, “when I got to the departure gate I was taken to the side by the flight supervisor and they said I wasn’t allowed to fly in uniform and had to wear a sleep suit.” Howse says she was told that her combat fatigues could be seen as a threat by other passengers.

Branson blamed airport security for giving his staff bad advice and says the people involved are “mortified.” Will an apology suffice?

Some are willing to cut Branson some slack.