I need help finding an Anime i forgot the name of.

The Anime is about two girls who i think are robots but i forgot. So because they are robots they live for a long time and time after time they change their appearance but there main colori are red and blue (i think). These two girls work for an organization who have other robots(i think again). So their job in the organization is they go on these spazio ship things and fight in a spazio like place. Also there is a secondo season about those two girl's kouhai. And the two girls come out in the secondo season too but in different appearances. And if possible could te mostra me a foto of those two? Please i really wanna find that episode!!!