Oklahoma Governor Mary Fallin has ordered the National Guard to stop processing benefits requests from gay and lesbian service members.

As of September 3, service members in a marriage with a member of the same sex could apply for spousal benefits such as military I.D. cards, healthcare coverage, housing allowances and survivor benefits. The Pentagon announced last month that it would recognize the legal marriages of gay troops following a Supreme Court ruling that gutted the Defense of Marriage Act (DOMA), which prohibited federal agencies from recognizing such unions.

Fallin spokesman Alex Weintz told the AP that the agency was unable to process applications from gay couples because Oklahoma constitutionally bans such unions.

“Because of that prohibition, Gov. Fallin's general counsel has advised the National Guard not to process requests for benefits of same-sex couples,” Weintz said. “Gay couples that have been legally married in other states will be advised they can apply for those benefits on federal facilities, such as Tinker Air Force Base, rather than state run facilities.”

Weintz said that Fallin ordered the policy change on September 5.

National Guard officials in Texas, Mississippi and Louisiana are also refusing to process benefit requests from gay troops. All four states are run by conservative Republican governors.