When I enter the embassy in The Strip, and speak to Ambassador Crocker to complete the quest "Things that go Boom", on my way to exit the building, I'm approached by an NCR soldier saying something to the effect of; Imagine running into you outside of The Strip, he then proceeds to attack me, causing all NCR in the building to become hostile, and attack me. I became Idolized by the NCR after completing the quest, what's going on? Is there a way to get rid of this? I'm playing on the Xbox 360.

Wikia entry:

"Having been Idolized by the Boomers and getting them to pledge their support to you/NCR (Mission For the Republic) the courier may be challenged by an NCR MP Officer on entering the NCR embassy to report to Ambassador Dennis Crocker. The Officer will simply say this is what happens to those who cross NCR and then attack - this seemed to happen regardless of player/NCR fame. The glitch can be reset by quickly entering the embassy and then returning to the strip before the MP catches the Courier."

Ahh. Simple enough. Thanks.