Hesham,
This is the large-scale, external augmentor V/STOL model tested in the NASA Ames Research Center's 40' x 80' wind tunnel in the late '70s and early '80s.
In a sense, this model is a follow-on from the large-scale models of the 1960s (first wing a straight wing, later replaced with a swept wing of the same aspect ratio). A flight research vehicle was projected (which was to be built by Boeing).
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720009048_1972009048.pdf
For more on your model, search D. B. Garland. For more on the earlier models, search D. C. Whittley.
[Added] Oops, image link corrected.
BTW, the 1966 model was part-funded by the CDRB (Canadian Defence Research Board, now DRDC). The engine in your model would be one of the 24 J97-GE-3 UAV turbojets put in storage at Ames after the 1971 termination of the AQM-91 Compass Arrow project.
There are a number of papers by Don Whittley available on the web. Unfortunately, most are for purchase as 'hard copies'.