U.S. European Command is urging troops, civilian employees, and military families across Europe to sharpen their awareness of suspicious behavior. The command also wants personnel to limit the digital information they expose while traveling or conducting daily activities.

The campaign, branded “See Something, Do Something,” was announced this week as an effort “to foster a proactive mindset” toward security and force protection. It reaches beyond military installations and calls for vigilance in public spaces throughout Europe.

European Command did not identify a specific threat that triggered the initiative. However, the announcement arrives amid heightened concern about drone incursions and other hybrid threats directed at U.S. and allied military forces across the continent.

The command described protecting American personnel and their families “as a shared responsibility vital to sustaining long-term combat readiness alongside global partners.” That approach places individual awareness alongside broader military security measures.

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Members of U.S. military communities are being encouraged to remain alert in crowded public places, including transit hubs. They should report any “unusual behavior or unattended items” to military police or local authorities.

Troops and their families are also “urged” to maintain “rigorous digital discipline.” Recommended precautions include reviewing privacy settings on social media, disabling geotagging on fitness applications and mobile devices, and avoiding online posts that reveal locations or travel plans.

The announcement cites recommendations from security experts to alter commuting routes, travel schedules, and activities away from military installations “to reduce predictability.” Those precautions are intended to make daily patterns more difficult to track.

U.S. personnel and their families “are our most precious asset, and their safety is our highest priority,” Gen. Alexus Grynkewich, commander of U.S. European Command, said in the announcement. “By embracing a proactive security mindset and enhancing collective vigilance, we build a stronger force protection environment that keeps us safe and ready.”

The campaign comes as concerns increase around hybrid warfare involving Russia and targeting U.S. forces and NATO allies. Such activity can remain below the threshold of war and often occurs without a clearly identified perpetrator.

Russian misinformation and intimidation aimed at American military personnel and their families through social media and hacking have long been concerns. Since Russia invaded Ukraine in 2022, that hybrid activity has become more aggressive and disruptive.

The growing list of concerns includes undersea pipelines and cables affected by what Western officials believe was sabotage. GPS jamming and spoofing have also become more frequent, while drone incursions around sensitive locations such as military bases and airports have increased.

In September, Germany accused Russia of organizing a failed attack involving explosive laden drones at Leipzig/Halle Airport. The airport serves as a key logistical hub for Western supplies headed to Ukraine.

Later that month, a report about suspicious vehicles near RAF Fairford led authorities to arrest several men in connection with a suspected terrorist plot. British officials said Iran may have been involved, and the incident prompted the United States to remove B-1 bombers stationed at the base.

Another warning surfaced in October after authorities discovered a drone carrying a canister of explosives near a different German airbase. The German military then raised its Russian sabotage threat assessment to “substantial,” its second highest level.

German military officials warned that the threat was no longer limited to facilities used to train Ukrainian troops or to major military installations. Germany hosts more than 30,000 U.S. military personnel, giving the new vigilance campaign a substantial audience in one of America’s largest military communities in Europe.

European Command’s message does not point to one particular plot, perpetrator, or incident as the cause of the campaign. Instead, it asks the wider U.S. military community to treat physical awareness, reporting, and digital discipline as everyday force protection responsibilities.

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