Hello there, sorry no chapter today but posting a background so you guys can get a feel for the situation. So without further ado, let's begin.
To start with, the Kosun Peninsula is by what you can guess, mirrored off the Korean Peninsula in the real world. Nothing has changed much in this iteration so we'll get on with the timeline of everything that has happened so far.
From what we know, the Neuroi war still continues from it's outbreak in 1939. Everything is as it was in the show, at least chronologically. The only deviation is what happened after the Movie, which was in 1945. After that, this is what I came up with to what happened. The Allies have only taken back 1/4th of Karlsland and the surrounding area. Neuroi attacks in Afrika still occur from time to time but are easily defeated by local forces. By this time, the etherjet striker units created by the researchers in Neue Karlsland are in full production and are being distributed to new Jet unit's such as JV 44, (Although the unit was created for battlefield testing of the Jet Striker) During all this time, Karlsland decided to forward their research to the other allied nation but only to discover that they had their own Etherjet programs. Soon the Britannians were the first other allied nation to unveil their newest creation, the Meteor. The Liberion introduced the P-80 Shooting Star and then soon later, the F-84 Thunderjet. Orussia, developed the Mig-9. As these new Etherjet's were introduced to witch unit's and fighter unit's respectively, work began on improving the design and the engineers at North Liberion Aviation developed what will become the F-86 Sabre, which first test flew in 1947. But as this breakthrough happened, terrible news arose out of Asia. As seem to be returning with a vengeance, Neuroi Hives appeared over Shanghai, once again bathing the city in flames. The Allies had a new front to deal with and with a hive appearing so close to the Fuso Mainland, it shocked the members of National Diet (Japanese/Fuso Parliament) Seeing that the Fuso military has not updated their weaponry and arsenal since the outbreak of the war, it sought the United States of Liberion for assistance. New weapons from the powerhouse of the allies began to flow into Fuso and unit's were modernized with the standards that made up the U.S. Army. Seeing this, the Diet realized that Fuso's military needed to be revised, no longer were they an empire as the Neuroi threat loomed across the sea did the Diet decided along with the modernization came a change in name. All the IFN and IFA unit's were melded into a centralized force that can respond quickly in the case of an attack, this force became known as the Self-Defense Forces. (In the context for what it is, the SDF in the real world was created to help bolster Japan's defences in the case of an attack from the soviets, being that no soviet's existed and Japan was on the side of the allies, consider this to be a glorified name change if to say)
Realizing that the Neuroi can push through the Kosun Peninsula to get a launching board to attack the Fuso Mainland, the allied command decided to station additional troops to help bolster the Republic of Kosun Army. (Since communism never existed, or never spread, Kosun/Korea is it's own Republic, based on the real South Korea) But an operation destroyed the Shanghai Hive and thought to bring the Asia threat to an end, but the allied command was weary, aware of what happened in Venzia years past, the unit's were still stationed in Kosun just incase something happened and they would need to fight again. By the time this happened, Orussia introduced it's newest Fighter/Striker Unit, the MiG 15.(1949) As winter of 1949 rolled around, allied lines in Kosun began to lax, nothing had appeared since the Shanghai hive was destroyed which leads to the present time(Story arc) when the Neuroi suddenly attacked and pushed the allied forces to the Pusan Defensive line. (Pusan Perimeter in real life)
And this is where the story leaves off, I'm currently writing the next chapter to Kosun: 1950 so stay tuned but I hope that this filled any gaps and answered any question that anyone had. This is CaptainSentry and I'll see you guys in the sky!
