3-5-2-a doesn't restrict headwear, only the elbow, hand, finger/thumb, wrist or forearm. B covers only upper arm or shoulder and C covers only knees and ankles. D seems to apply but the term "medical reasons" doesn't state a doctor's note is required, so your state regulations pertaining to that requirement, if any, would apply. If I felt it wasn't a "threat" to others, I would let it go, if it was just padding and not hard plastic.
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Yom HaShoah
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