Rally Points and Checkpoints

Just a dumb question…but does anyone know how to activate certain rally points or checkpoints from the menu for Halo CEA in TMCC? On 360 it was really easy to do, but I can’t seem to figure it out with this menu system.

Nobody?

I’m too searching for an answer to this question and I’m not going through an entire level(s) from Rally Point Alpha to go looking and collecting stuff, sod that.

Exactly, I’m surprised it hasn’t been brought up more.