Sailors and Marines are being urged to “harden” their online profiles and conceal public ties to the military as foreign adversaries increasingly hunt for exploitable personal information.
Acting Secretary of the Navy Hung Cao also called on Navy Department personnel to remain “vigilant” against surveillance, harassment, and potential attacks.
In an Aug. 19 notice, Cao warned that hostile actors are conducting a “coordinated, multi-domain campaign” involving direct threats, organized harassment, and the publication of personal information. He linked the warning to an “evolving threat landscape” that has developed since the Iran war began in February.
“Recent incidents across the globe demonstrate a clear growth in adversary tactics, techniques, and procedures,” the notice said.
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“These are not isolated events; they are part of a deliberate effort to gather intelligence, test our defenses, disrupt our operations, and intimidate our force.”
The warning makes clear that enemy activity is not limited to the battlefield or some distant intelligence office. Adversaries are watching installations, studying personnel, tracking families, and searching for weak points through information that Americans routinely post online.
According to the memo, threats include aerial drones conducting surveillance around bases and direct efforts to attack military facilities. Harassment campaigns have also been used at installations to test security responses and gather information about how personnel react.
Navy and Marine Corps personnel, along with their families, have also faced direct harassment. Because of that growing danger, the department advised personnel to take “immediate action” by reviewing their social media accounts and limiting what strangers can see.
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“Remove any information that could identify your connection to the DON or reveal patterns of life,” the message says. “Adversaries are actively mining this data.”
That warning applies to more than photographs of uniforms, ships, aircraft, or military facilities. Public posts can reveal work schedules, travel routines, favorite restaurants, family connections, home locations, and other details that allow hostile intelligence services to build a surprisingly complete picture.
The Aug. 19 notice also directs sailors and Marines to report suspicious behavior to the Naval Criminal Investigative Service. Reportable activity includes being photographed or watched, facing unusual questioning, or spotting drones around installations and sensitive locations.
Digital security has remained a major concern for the military both before and during the Iran war. In December, U.S. Central Command directed troops to disable geolocation services and examine the privacy settings on their phones and other personal devices.
Since fighting began, military officials have issued additional warnings and restrictions as Iran has used online photographs, videos, and commercially available information to identify and track Americans. What may look like harmless content to a service member can become targeting material once an adversary collects it and combines it with other data.
Earlier this month, Sky News reported that publicly available information from the fitness application Strava exposed routes and routines used by troops and contractors. The data reportedly included activity around locations in Bahrain and Jordan, both of which were targeted by Iran during the war.
Some of those attacks produced fatal consequences, demonstrating that digital carelessness is not merely an administrative headache cooked up by headquarters. More than 750 American troops have been wounded in action since Feb. 28, while 18 have been killed.
Fitness tracking applications are particularly dangerous because they can preserve repeated movement patterns over long periods. When enough users follow the same routes, adversaries may be able to identify base entrances, housing areas, exercise schedules, and locations that are supposed to remain obscure.
Cao’s warning reflects a battlefield where hostile governments no longer need spies standing outside every gate. Social media platforms, commercial data brokers, personal applications, and publicly accessible photographs can do much of the collection for them, especially when service members hand over the details voluntarily.
The message to sailors and Marines is straightforward: lock down personal accounts, remove military identifiers, disable unnecessary location tracking, and report anything suspicious. In an era when adversaries are mining every available scrap of information, basic digital discipline has become part of force protection.
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