Are you asking how many beneficiaries?
Tricare (TriWest Healthcare Alliance) is run in regions...think Hillarycare, it's the same thing. TriWest serves the Central Region, which includes most of the western states: Arizona, Missouri, New Mexico, Utah, Colorado, Montana, North Dakota, Wyoming, Idaho, Nebraska, South Dakota, Kansas, Nevada, and parts of Texas.
If you leave the region, your coverage changes to the contractor that covers the region you move to. The only exception is people who leave the region temporarily..i.e., deploy.
So to answer your question, the only people affected outside CONUS are those who have deployed from this region.