On 1 June 1968, the Mistys began the loan of their services to the U.S. Navy for Operation Sea Dragon. On 11 June 1968, the Mistys began the first night Fast FAC missions of the war. On the nights of 13 and 14 June, they tested a Starlight Scope for FAC operations. The preliminary results seemed promising, so the Mistys began flying missions with the Scope in the rear seat with the observer on 8 July. As it turned out, the Scope was too bulky for easy use, and did not work in moonless periods. A Misty was lost in action on 16 August 1968, and another the following night. The night FAC mission not having observed anything more than an ordinary fighter pilot, it was cancelled after this second loss.