Premise: The 315th Operations Group is a United States Air Force Reserve unit assigned to the 315th Airlift Wing. The unit is stationed at Charleston Air Force Base, South Carolina. The 315th Group controls all operational McDonnell Douglas C-17 Globemaster III flying squadrons of the 315th Airlift Wing. It was activated in 1992, when Air Force Reserve Command implemented the Objective Wing organization.
Hypothesis: Charleston Air Force Base was build in 1991