They're just wind-tunnel models used by NASA to test a variety of conditions and configurations. They don't represent a project as such, though actually they're nice, clean designs. They feature in a number of NASA papers.
MacAir tested a very similar wind-tunnel design here:
execuse me my dears,I don't remember if that Langley fighter was
a familiar or not.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19890019115_1989019115.pdf
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