After the Franco's victory in 1939, 22 captured "donkeys" were assigned to Grupo 28 at an air station in Mayorca and later had their number increased to 52. The I-16's had designations from 1W-1 up to 1W-52. The first 22 captured I-16's, that arrived acted as group 1W, then the designation of group changed to Grupo 28 de Caza. The group was based at air station, San-Juan on the island of Majorca. All the I-16's had, by the autumn of 1940, been transferred to Sevilla where they joined Grupo 26 (22-nd mixed fighter group, 22 Regimiento Mixto de Caza, also flying "Fiats"). In 1945 the Spanish Air Force started on new system of designation. "Rata" then received an index C.8. The colour scheme was changed, a light blue bottom with lateral surfaces of sand color with green camouflage spots of irregular shape. Recognition symbols of red and yellow cocardes were added to the sides of the fuselage plus both the top and bottom surfaces of the wing. The identification code of "C. 8" with the original '1W' plane number beside it. The code was painted on the tail. At about this time, Grupo 26 was renamed to Grupo 22. In the early 1950's, I-16's were used at a flight school in Morona. The last serviceable I-16, with the code C.8-25, was flown by the most skilled instructors of the school. In August 1953, Spain signed a military assistance contract with the USA, which included delivery of modern fighters. On August 15th 1953, Miguel Entrena, for the last time, lifted into the sky in an I-16. So the career and fighting service of the "Rata" in Spain had finished.