NASA 616  with two 25 inch diameter nacelles designed to contain the J85-GE-13 afterburning turbojet engines. The first of over 300 flights testing various inlet and nozzel configurations started at the Lewis Research Center on 03 June 68.

Information and photo from the souvenir booklet issued by the NASA Langley Research Center in conjunction with the retirement of NASA 816 on 17 May 1991.