Mecha-doc is a 1984 shōnen, cars and racing centred comedy anime that follows a small garage of dudes that tune up various mechanical things professionally and passionately. The main dude named Jun absolutely hates street racers and will always go out of his way to shut them down in various forms, which sometimes includes partaking in street racing himself.
Episode three starts off with the kiddoes in boot camp, taking place about five years (maybe two?) after the attack on Shiganshina, as they are working on becoming soldiers for the various sections of the military. As soon as some of the characters that I will grow to love and hate with equal measure started being introduced, all I could think was, “Holy shit, they are babies!!!” They are all so young and so green.