Amidst war and chaos

Arthur, a boy form earth who died in an accident and get reincarnated into a body of another teen-ager who shares the same name as his and was a soldier in the ace battle team. but when he got reincarnated into his body he found that he was already in between war with some extraterrestrial species. what will he do? how will he save himself? will he be able to survive in this chaotic war or die a graveless death?