What Does "ODHG" Mean?

I assume "Rock Ring" is Halo, and "ODHG" is ODST (he says it's the best game in the series, based) and then the multikill announcements. If ODST means Orbital Drop Shock Trooper, does ODHG mean Orbital Drop Heat (something that begins with G)

I assume "Rock Ring" is Halo, and "ODHG" is ODST (he says it's the best game in the series, based) and then the multikill announcements. If ODST means Orbital Drop Shock Trooper, does ODHG mean Orbital Drop Heat (something that begins with G)