A former U.S. Army analyst working at Fort Sill is facing charges.
Investigators say Liangtian Yang, also known as Alfred Yang, had his security clearance revoked because he failed to report his marriage to a Chinese citizen.
He was arrested last week at the Minneapolis airport.
Authorities say he was carrying an electronic copy of a restricted army field manual.
A judge has rejected Yang's request to be freed while his case is pending.
He is charged with theft of government property.