The Number 23

Has anyone noticed that a lot of the vehicles you see in cutscenes and such in the game have a 23 on them? I just noticed this recently (I don’t mind it 23 is my favorite number, Thanks Michael Jordan lol) but does anyone know why it is? I remember seeing two different vehicles and they were both 23 so I know it wasn’t me seeing the same vehicle in two different cutscenes. Not really important just wondering if anyone had answers to this!

was it all of the halo vehicles or just one

I just noticed it a lot in Halo Reach and I think it was on multiple vehicles in the game.