In the midst of World War II, the Polish government-in-exile held secret meetings with neutral Sweden to build up a Polish-led coalition to take its homeland from the Nazis before the Soviet army conquers it for their own territory. With Swedish approval, the Free Polish Forces secretly assembled a large airborne invasion force in neutral territory, with obsolescent fighter aircraft like Hawker Hurricanes & P-40 Warhawks, British-trained Polish commandos in small cargo planes, and Allied volunteer pilots that have already completed their service. With the vast majority of pilots being Americans as well as Polish, their squadrons were dubbed Kosciuszko Squadrons in honor of American pilots who volunteered with the Poles during the 1921 Polish-Soviet War.
Their moment came in late summer 1944, when the Polish resistance launched a nationwide uprising in hopes to tie down Nazi forces and await support from the Red Army, which suddenly stopped their push westward. Fearing that the Soviets were allowing the Germans to destroy the resistance, the entire force in Sweden launched across the sea to Poland, left to fate as they were not allowed to return if the campaign failed. The Kosciuszko fighter pilots made quick work of enemy air defenses, armor, supply lines, & some enemy aircraft, while cargo planes dropped or landed with Free Polish forces & supplies. At the same time, several Polish armored & infantry units in the Red Army bolted away from the Soviets to join in the fight, providing the resistance with needed armored forces. The Soviets attempted to pursue, but where held off by the volunteer and Finnish air forces, halting their advance indefinitely. Through secret meetings, Finland pulled away from the Axis powers and allied itself with Poland, and provided support by distracting the Soviets in the north. The fighting finally ended just before the winter began in 1944, with most of north & central Poland liberated, and the western Allied forces now supporting a second front in place of the Soviet effort in the war, barring the USSR from continuing to Germany and finishing the war in 1945.
In the current late 1950s, Poland is a democratic member of NATO and one of the most heavily-defended nations along the border with the Soviet Union. The halting of the Red Army at Poland also prevented the conquest of Czechoslovakia & Yugoslavia, which only Romania & Bulgaria fell to Soviet power. Yugoslavia under Josip Tito remains a moderate communist state, with limited relations to both Western Europe & the Soviet Union. The former volunteer air force was split from the Polish Air Force into a private military company, Kosciuszko Squadron Enterprises, but remains a vital service in Europe with training NATO air forces and providing security during the early Cold War.
The F-86 Sabre is the Squadron's primary fighter jet, and has been used in more proactive roles in providing security escorts near the Soviet border and over the Baltic Sea.