You are correct with the red, which I also have, but these are from my wife’s squadron and are the ones they give out to guests, I guess I am just a guest .Generally, the remove before flight stuff is red, and the blue leaves me mystified... we had a retirement ceremony for a lady in my wing, her husband was there, and for one of the gifts from the unit, the other girls gave her a red sleep shirt with "remove before flight" across front.