You learn something new every day (at least I do, which suggests nothing but my staggering ignorance of years past). In researching the Outer Space Treaty of 1967, I stumbled upon United Nations Office for Outer Space Affairs. Based in the United Nations offices in Vienna, it's "responsible for promoting international cooperation in the peaceful uses of outer space." I didn't even know the thing existed.

In the space opera I'm outlining, R.J. Stone is the mission commander of UNSA's Wayfarer One, the first manned interstellar mission. As of this moment, in the late 22nd century UNSA--the United Nations Space Agency--is headquartered in Vienna, within sight of the original offices of the UNOOSA.