I'm surprised this hasn't been posted yet but the BBC ran a report about the United Nations Security Council last Thursday and used this logo on the TV report: Apparently this is from the United Nations Space Command, from the Halo game. Well done BBC News! EDIT: Video evidence
[Sgt. Avery Johnson]Hah, I can assure you it is, soldier! The Spartan known as Unicorn7337 holds the rank of Field Marshal and didn't get it handed to him! That tough son of a bitch fought his way through wave after wave of covenant scum and I'd have pinned the medal on his armour myself if I could have! Aside from the 'Chief, there's nobody I'd want beside me going into battle more![/Sgt. Avery Johnson] /Halo nerdism Oh also LoL BBC!
I suspect it's more likely that a lazy employee typed "UNSC logo" into google images and pulled off the first image they found....