Fifteen years ago, the Belkan Federation began a war of conquest, invading nearby territories. To stop them, a military alliance was set up between the Osean Federation and the Union of Yuktobanian Republics. These two great powers drove the Belkans back but their counter-invasion was cut short when the Belkans detonated 6 nuclear warheads on their own soil, preventing the alliance from advancing on them. This ended the great war and a time of peace has reigned. The Osean and Yuktobanian nations have remained allies. On the small remote, "Sand Island", off the western coast of Osea, a skilled veteran of the war named Captain Bartlett (callsign: "Heartbreaker") trains new pilots as the 108th Tactical Fighter Squadron, designated "Wardog" in the Osean Air Defense Force (OADF). During a routine training operation, unidentified aircraft appear on the radar and proceed to shoot down many of the squadron's not fully trained pilots. The squadron is left with few survivors, and the incident covered up while the military tries to figure out what's going on. Soon after, the nation of Yuktobania declares war on Osea, thus beginning a new conflict.
