A concept made for Halo 5 that was never used. Pity. Usually Sparth's concepts are a misshapen smear of bevels and arches and vaguely human forms, but this one is pretty good. I could easily see that as a UNSC hospital.
Rho 'Barutamee, fleetmaster and commander of the Long Night of Solace. He slipped inside Reach's defenses and lay undetected for days, and when he was discovered he fought Reach's defense fleets to a stalemate until a certain team of Spartans slipped a Slipspace bomb past him.