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The U.S. military claims to have “successfully” disrupted the online propaganda efforts of the Islamic State in a hacking operation dating back at least to 2016, according to declassified national security documents released Tuesday.

The heavily redacted, previously top secret documents said the U.S. Cyber Command “successfully contested ISIS in the information domain” and limited its online efforts on radicalization and recruitment “by imposing time and resource costs” on the jihadi group.

The documents released by the National Security Archive at George Washington University offer the most detailed look at “Operation Glowing Symphony,” the first offensive hacking operation acknowledged by the Pentagon.

The assessment pointed to a “significant reduction” in the online campaign waged by ISIS, but added that the Cyber Command efforts were slowed by a “lengthy and difficult” process for approving its operations.

It said that, given the expectation of “more frequent and widely scoped cyber operations,” better procedures should be in place to “help expedite the request and approval process.”

Officials have previously acknowledged the use of offensive cyber weapons as part of the U.S. arsenal, but the newly released documents offer the most detailed assessment of the moves against ISIS by a joint task force created in 2016 by then-President Barack Obama.

According to a statement from the university archive, “Glowing Symphony” was initially approved for a 30-day window in late 2016 but a July 2017 administrative message extended the operation, and it was unclear if it is continuing.

The documents released under a Freedom of Information Act request “reveal the unprecedented complexity of the operation, resulting challenges in coordination and deconfliction, and assessments of effectiveness,” the GWU archive said.

The hacking operation represents the US response to concerns about how extremist groups had been using social media and online services to promote their cause, often seeking to spread propaganda for recruitment and radicalization.

According to the university archive, the latest documents and public comments by Cyber Command chief Gen. Paul Nakasone offer clues to how the joint task force operates and what it may do in response to efforts to disrupt the US election campaign.

Nakasone said in a 2019 interview that another task force called the Russia Small Group had been formed to be able to “rapidly to address a threat” to the campaign.

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