WASHINGTON (AP) — Warning that extremism in the ranks is increasing, Pentagon officials issued detailed new rules Monday prohibiting service members from actively engaging in extremist activities. The new guidelines come nearly a year after some current and former service members participated in the riot at the U.S. Capitol, triggering a broad department review.

According to the Pentagon, fewer than 100 military members are known to have been involved in substantiated cases of extremist activity in the past year. But they warn that the number may grow given recent spikes in domestic violent extremism, particularly among veterans.

Officials said the new policy doesn’t largely change what is prohibited but is more of an effort to make sure troops are clear on what they can and can’t do, while still protecting their First Amendment right to free speech. And for the first time, it is far more specific about social media.

The new policy lays out in detail the banned activities, which range from advocating terrorism or supporting the overthrow of the government to fundraising or rallying on behalf of an extremist group or “liking” or reposting extremist views on social media. The rules also specify that commanders must determine two things in order for someone to be held accountable: that the action was an extremist activity, as defined in the rules, and that the service member “actively participated” in that prohibited activity.

Previous policies banned extremist activities but didn’t go into such great detail, and also did not specify the two-step process to determine someone accountable.

What was wrong yesterday is still wrong today, said one senior defense official. But several officials said that as a study group spoke with service members this year they found that many wanted clearer definitions of what was not allowed. The officials provided additional details about the rules on condition of anonymity because they were not made public.

The military has long been aware of small numbers of white supremacists and other extremists among the troops. But Defense Secretary Lloyd Austin and other leaders launched a broader campaign to root out extremism in the force after it became clear that military veterans and some current service members were present at the Jan. 6 insurrection.

In a message to the force on Monday, Austin said the department believes that only a few service members violate their oath and participate in extremist activities. But, he added, “even the actions of a few can have an outsized impact on unit cohesion, morale and readiness – and the physical harm some of these activities can engender can undermine the safety of our people.”

The risk of extremism in the military can be more dangerous because many service members have access to classified information about sensitive military operations or other national security information that could help adversaries. And extremist groups routinely recruit former and current service members because of their familiarity with weapons and combat tactics.

The number of substantiated cases may be small compared to the size of the military, which includes more than 2 million active duty and reserve troops. But the number appears to be an increase over previous years where the totals were in the low two-digits. But officials also noted that data has not been consistent so it is difficult to identify trends.

The new rules do not provide a list of extremist organizations. Instead, it is up to commanders to determine if a service member is actively conducting extremist activities based on the definitions, rather than on a list of groups that may be constantly changing, officials said.

Asked whether troops can simply be members of an extremist organization, officials said the rules effectively prohibit membership in any meaningful way — such as the payment of dues or other actions that could be considered “active participation.”

Pentagon spokesman John Kirby told reporters that “there’s not a whole lot about membership in a group that you’re going to be able to get away with.” He added, “In order to prove your membership you’re probably going to run afoul of one of these criteria.”

Kirby also said that commanders will evaluate each case individually, so simply clicking “like” on one social media post, for example, might not merit punishment depending on all the circumstances involved.

He also noted that the Pentagon does not have the ability or desire to actively monitor troops’ personal social media accounts. Those issues would likely come up if reported to commanders or were discovered through other means.

The regulations lay out six broad groups of extremist activities and then provide 14 different definitions that constitute active participation.

Soon after taking office, Austin ordered military leaders to schedule a so-called “stand-down” day and spend time talking to their troops about extremism in the ranks.

The new rules apply to all of the military services, including the Coast Guard, which in peacetime is part of the Department of Homeland Security. They were developed through recommendations from the Countering Extremist Activities Working Group. And they make the distinction, for example, that troops may possess extremist materials, but they can’t attempt to distribute them, and while they can observe an extremist rally, they can’t participate, fund or support one.

The rules, said the officials, focus on behavior, not ideology. So service members have whatever political, religious or other beliefs that they want, but their actions and behavior are governed.

In addition to the new rules, the Pentagon is expanding its screening for recruits to include a deeper look at potential extremist activities. Some activities may not totally prevent someone from joining the military, but require a closer look at the applicant.

The department also is expanding education and training for current military members, and more specifically for those leaving the service who may be suddenly subject to recruitment by extremist organizations.

More than 650 people have been charged in the Jan. 6 insurrection at the Capitol, including dozens of veterans and about a half dozen active duty service members.

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