Actually, they were pretty much the same story.
Useless girl wants to be a pilot, useless girl gets tested and is promptly rejected (by means of forehead seal), then does something mildly useful and gets instantly accepted.
Girl goes on being useless with lol drama of "I shud be the one piloting that Buster Machine!" "Go find one for yourself in Pluto lol".
Girl finally becomes useful, only instead of taking the Buster Machine superweapon, she becomes the Buster Machine herself.
And it went awesome from there.