Okla. Stat. tit. 80, § 80-4: Military reservation ceded - Rights reserved

Exclusive jurisdiction be, and the same is hereby ceded to the

United States over all the territory now owned by the United States

and comprised within the limits of the Military Reservation of Fort

Sill, in Comanche County, as declared from time to time by the

President of the United States, and over such lands as may hereafter

be acquired for the enlargement of said reservation; provided,

however, that the State of Oklahoma reserves the right to serve

civil or criminal process within said reservation in suits or

prosecutions for or on account of rights acquired, obligations

incurred, or crimes committed in said state but outside of such

cessions and reservation; provided, further, that the State of

Oklahoma reserves the right to tax railroad companies and other

corporations and their franchises and property on said reservation;

and provided, further, that the jurisdiction herein ceded shall

continue no longer than the United States shall own and hold said

reservation for military purposes.