Steam is now accepting pre-purchases of Air Conflicts: Vietnam, preparing for the release of the air combat sequel on October 2nd. In addition to a 10% discount for this advance commitment, they also offer a free copy of Air Conflicts: Secret Wars as a bonus. Those who already own it can gift it to a friend (or a stranger for that matter). Word on the game is that allows you to: "Take a seat in the cockpit of fighter planes and helicopters and plunge right into daredevil aerial battles above the jungles of Vietnam! Prepare for a mind-blowing flight simulation with exotic landscapes, detailed airplane models and challenging missions that will put your piloting skills to the ultimate test."