This Gnat was testflown in Jun-1958 as G-39-8 and acquired the same month by the Yugoslav Air Force for evaluation with serial 11601. It was withdrawn from use in 1962 and handed over to the Muzej Vazduhoplvstva Beograd on 31-Aug-1963. It is not carrying its assigned serial 11601 here.

In June 1958 Yugoslavia purchased two examples of the private-venture Gnat for evaluation, both being delivered by rail. They were flown by the flight test centre but one was written off in a belly landing after a hydraulics failure in October 1958. Although at one stage there was interest in licence production of up to 700 single and two-seater Gnats, no further aircraft were ordered and second-hand F-86 Sabres were acquired instead

The Gnat was an attempt to reverse the trend towards ever more compex fighters. Two were delivered to Yugoslavia for evaluation.