Two episodes from the flying career of pilot Stefan Stec.
In the Austro-Hungarian aviation: on 16 July 1918 Stec in a formation with two other pilots (F. Navratil and Franciszek Peter) shot down an Italian Hanriot HD-1 fighter near Lake Garda, and on 10 August he shot down his third plane over Monte Pasubio. In the Austrian service, he was decorated with the Order of the Iron Crown of the Third Class with war decoration, twice with the Silver Medal for Courage and with the Prussian Iron Cross of the Second Class.
In the Polish Air Force: On 29th April, piloting a Fokker EV, he fought the first victorious air battle in the reborn Poland, shooting down a Ukrainian Nieuport aircraft covering two Brandenburg reconnaissance planes over Sokolniki.
On his plane, still in Austrian service, Stec had a red-and-white checkerboard painted as his personal emblem. This chequered pattern was adopted on December 1, 1918, by order no. 38 of the General Staff of the Polish Air Force, as a distinctive symbol of the Polish Air Force.
He destroyed 7 enemy planes and two observation balloons, and was himself shot down three times.
Unfortunately I didn't find Ukraine as a country in FMB.
https://www.mediafire.com/file/sadabfrgiwnl7nt/In_two_armies.zip/fileOf course the missions should be installed in DOF. Sorry , I forgot