 During operation Velvetta 2 Spitfires were repainted in Yugoslav Air Force markings for the flight from Kunovice to Nikšić.The rest were shipped in crates, officially declared as scrap iron, along with 12 Merlin 66 engines, and deliveries lasted until the end of April 1950.Czechoslovakia also trained 81 pilots and 69 ground crew specialists, some of them later forming the first fighter unit of the Israeli Air Force, and on Czechoslovakian soil a group of Jewish volunteers the size of approximately a brigade (about 1,300 men and women) were also trained, from August 20, 1948 until November 4, 1948.