Cortana: The message just repeats, Regret; Regret; Regret.
Commander Keys: Roger, any idea what that means?
Sgt. Johnson: Dear humanity,
We regret being alien bastards,
We regret coming to earth,
And we most definetly regret that the core just blew up our raggedy ass fleet.
Marines: HOORAH!
Sgt. Johnson: This is it baby, hold me...
Johnson and an elite hug!
if you wanna hear them, here's the place:
http://www.youtube.com/watch?v=ftPBhfc-Q9s
The first quote is at the beginning, and the second is at the end.
And in the immortal words of SubZero, Cheers!