Aoki Ryuusei SPT Layzner

In an alternate 1996, the US and USSR take the Cold War to Mars. A group of teenage cadets, the Cosmic Culture Club, are sent as a message of goodwill to both sides by being assigned to the neutral UN base on Mars. However, it's not long before their visit is interrupted by a group of unidentified giant mecha that battle around the base, leading to the deaths of many personnel and teenagers.