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The 'IR' markings seem to stand for 'Istrazivanje Razvoj' or Research and Development. According to the Dayton agreement these aircraft have been stripped of their armament and armament wiring.
This photo is copyright © Joop de Groot, and may not be used or published in any way without permission.
It was added on 15 June 2018, and has since been viewed 477 times.