Lt. General Jack O'Neill and Dr. Nicholas Rush wearing sunglasses.

Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. Colonel Jack O'Neill and Lt. Colonel John Sheppard often wore sunglasses on off world missions. (Stargate) (SG1: "Emancipation") (SGA: "Underground")

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