The 7th Intelligence Corps were formed by Winston Churchill in order to gather vital information on the Chimera.
After the formation of the 7th Intelligence Corps, the organization purposely gathered information on the Chimera and captured live specimens for study. They also were presumably present when an Angel was captured for the British/American exchange. The 7th Intelligence Corps helped evacuate the Angel when London fell to the Chimera. It's unclear how many members (if any) survived the invasion.