Mostly in not dying horribly for the third time in a year?
[Ianto/Doctor] Sentient World Observation and Response Division. Originally part of SHIELD but now a separate organisation, founded to protect Earth from intergalactic threats. They've got three main departments - Operations, Communications and Scitech (military, diplomacy and research, roughly). I've really only dealt with SHIELD since I've been here but from what I know they've been busy establishing a space station as an additional non-Earth base.