 Complete the following phrase:  For a short time, from January 6, 1937, Tinker served in a light bomber squadron, flying obsolete Breguet 19 bombers. From January 23, he, along with some other American pilots, was assigned to a fighter unit, 1st Escuadrilla de Chatos commanded by Andrés García La Calle, flying Soviet Polikarpov I-15 Chato biplanes. In 1937, he flew many combat missions against the Fascist Falange air forces, generally duelling Germans and Italians. The squadron first entered action on February 10, and took part in a 