The Contingency Force was a rapid reaction capability maintained to deal with lesser contingencies.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

"We are constantly reviewing the extent of the G4S shortfall and the military contingency force, " the Home Office said before the extra 1, 200 were deployed Tuesday.

CNN: UK deploying 1,200 extra Olympics troops

The Base Force was oriented around the historic, U.S.-centric, two-ocean view of the world, consisting of an Atlantic Force, a Pacific Force, a Contingency Force, and a Strategic Force.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2