I really hope this idea....... takes off.
This one time I was flying with KLM, and sat in the front row of economy next to this young guy in shirt/trousers. Before he took off, the pilot came out to greet him, and for the entire eight-hour flight all the stewardesses would come and talk to him, ply him with extra blankets, and generally made sure he was comfortable. Needless to say I was curious - I don't think he was a celebrity because, well, he'd be in first class, surely? He wasn't in uniform, so not a trainee or anything either.
They all spoke bloody Dutch to each other. To this day I have no idea who he was or why he was special.
Say what you want but if this Halo TV series is a BIG BUDGET Game of Thrones style series with Spielberg directly producing this could be a Band of Brothers in space.