Harassment Of Navy Destroyers By Mysterious Drone Swarms Off California Went On For Weeks

The map depicts Paul Hamilton making an abrupt right-hand turn while a drone closely follows the ship. The legends and annotations of the map have been redacted under FOIA exemptions that apply to technical data that have military applications. Though the title of the document reads July 17th, the map appears to refer to drone encounters that occurred in the incidents on July 14th and July 15th.

Intriguingly, one of the position points of the drone is marked with a star, while others show a dashed line around a given area. It is unclear exactly what these indicate without the map legends, though the star suggests at least one particularly notable event. Our previous coverage indicated that the incident involved multiple contacts that maneuvered around the ships in a highly dynamic way, and there may have been uncertainty about the exact location of the drones at times.

The deck logs from the period show that Ship Nautical Or Otherwise Photographic Interpretation and Exploitation (SNOOPIE) teams were deployed frequently during the incidents. SNOOPIE teams consist of sailors specifically trained to enhance situational awareness and to document unknown contacts or other events and objects of interest.

It is highly likely that a number of photographs exist of the drones given the work of the SNOOPIE teams and other onboard sensors. The same document providing the map above also contains a reference to a photograph of the drones, which has been completely redacted under the same technical data exemptions.

According to deck logs, the proximity of the drones also led the ships to exercise enhanced “emissions control,” or EMCON, protocols designed to minimize their electronic profile. An extensive analysis by War Zone editor Tyler Rogoway explains that drones could play a useful role in provoking reactions from an adversary as a means to capture highly prized electronic intelligence (ELINT) and sensitive operating procedures. Intriguingly, references to EMCON were not universal throughout the encounters, and do not appear to have been as relevant in the newly released documents.

Previously, the majority of available documents suggested that the drone encounters were limited to the evenings of July 15th and July 16th, 2019, with a second, but minor series of events occurring towards the end of the month. New logs show that sightings persisted sporadically throughout the second half of July with another significant event happening in the early hours of July 30th. Indeed, as early as the morning of July 17th, the USS Russell, another Arleigh Burke class destroyer, continued to report drone sightings, as seen in the portion of the log below.

It is very noteworthy that several days later, on the 20th, the USS Russell conducted an initial counter UAS exercise.

Later in the same day, the Russell conducted another set of counter UAS exercises, this time firing a 5-inch naval gun. Speaking to USNI News, retired Navy officer Thomas Callender explained that 5-inch deck guns have been tested as a counter UAS weapon in the past with limited success, stating "they found that the 5-inch gun took multiple shots to try and hit it because it’s not designed for something slow and small." Callender's remarks were in the context of another incident in July 2019 that involved Marines onboard the Wasp class amphibious assault ship USS Boxer disabling an Iranian drone in the Strait of Hormuz using a vehicle-mounted electronic warfare system.  The logs from this period reflect that several shots were fired in the exercise, including at least one misfire.

Three days later, another drone was spotted by a SNOOPIE team at an elevation of about 400 feet. Note that in naval parlance, "calling away" refers to sending sailors to their posts.

A little over an hour later, flares were spotted, though the logs do not remark if these were connected to the ongoing drone sighting. Flares are not uncommon in the training areas off Southern California where the ships were operating.

The following day, a new term is introduced to the logs: “ghostbusters.” A log entry reflects an apparently brief counter UAS exercise lasting about eight minutes.

Though official references are hard to come by, “ghostbuster” is a term sometimes used to refer to lower-end counter UAS devices that look similar to rifles. 

These anti-drone countermeasures are increasingly being used by security forces around the world. They operate by using highly-directional radiofrequency jammers designed to disrupt communications between drones and their operators. One key limitation of these devices is that they can only disable drones that are directly controlled by a human operator. Autonomous systems are far more resilient against such countermeasures. Beyond that, their overall effectiveness varies heavily by type and circumstance. Aside from these limitations, they are relatively portable and easily fielded. 

It is not perfectly clear if the Russell had this equipment onboard previously, or if “ghostbuster” devices were brought onboard in reaction to the earlier drone incidents. If so, they would have been among the simplest counter-drone devices to field given their independent man-portable deployability. Our previous reporting did not show any indication of the use of these devices in the earlier incidents, and references to them appear shortly after the counter-UAS exercise, heavily suggesting they may have been introduced in response to the incursions. We are not aware of these systems being widely fielded on surface ships at the time, especially those operating in home waters. Also, only the USS Russell reported the use of "ghostbusters" in its logs. 

After a relatively quiet period, another incident occurred in the very early hours of July 30th. A SNOOPIE team was activated and “ghostbusters” were called for shortly afterwards. 

What follows are uncharacteristically redacted logs. As with the map of the drone movements earlier in this story, the exemptions pertain to technical military data. In the hundreds of pages of ship logs reviewed by us about this matter, these are the first to contain significant redactions and the only ones to reference this particular exemption.

By 3:00 AM on July 30, the pattern of redaction ends. In the same timeframe, at least two other ships nearby noted drone or UAV activity. As previously reported, the USS Kidd, another Arleigh Burke class destroyer involved in these incidents, deployed its own SNOOPIE team for UAVs at 2:16 AM that day. The log later notes that the SNOOPIE team was recalled by 3:27 AM.

Logs from the USS Paul Hamilton also reflect multiple drones spotted off the ship, and their own SNOOPIE team activated around 3:30 AM on July 30.

Later in the morning on the same day, the Russell again engaged its SNOOPIE team and the “ghostbusters.” 

This log entry also has a reference to "SCAT," which likely stands for Small Craft Action Team. Speaking to Business Insider last year, Navy Lt. J. G. Frank Smeeks, an anti-terrorism officer, explained that "SCAT is a team consisting of crew-served weapons machine gun operators that provide 360-degree coverage of the ship, an anti-terrorism tactical watch officer and a gunnery liaison officer. They are called away as a pre-planned response to threats the ship may face like a small boat attack or low, slow flyer." Logs from another nearby ship, the USS Bunker Hill, also indicate that they manned their own SNOOPIE team and SCAT in the same timeframe. The Bunker Hill logs are unclear if the SNOOPIE team was deployed in response to a drone sighting. The simultaneous use of three teams designed for quick reactions to potential threats suggests a high level of alarm well into the morning.

In this same general time period, it appears that the USS Russell was visited by an unnamed admiral. Deck logs record an admiral arriving on July 22, just prior to the implementation of counter UAS training exercises and the start of references to "ghostbusters" on the morning of July 24. Logs also remark about an admiral casting off on July 31, but there are few other indicators what the purpose of the visit may have been or if it had any connection to the UAS incidents.

Cumulatively, these records show a sustained, but an intermittent pattern of drone sightings throughout the month of July by Navy ships operating off Southern California. These events seemed to have spurred additional training and the rapid deployment of unique capabilities like the “ghostbuster” counter-UAS equipment. It remains unknown what impact, if any, this training and equipment had on deterring drone operations. At least three ships reported sighting drones in the very early hours of July 30th, with unusual and extensive redactions in the logs of the USS Russell, but we do not know what happened the next day, or in the weeks that followed.

It is also noteworthy that these events occurred well after Navy investigators sought to “correlate or rule out operations” with Fleet Area Control and Surveillance Facility (FACSFAC) based in San Diego. Indeed, an investigation began immediately after the initial events on July 16th, with information on the incidents being routed to the Chief of Naval Operations as early as July 18th. Given the progress of the investigation, more prosaic causes like errant US aircraft or civilian activity had already been examined. Whatever the outcome of the July 30th event, it was likely closely scrutinized by Navy leadership.

The lack of concrete identification of the aircraft involved also led to widespread public speculation earlier this year. Leaked photos and videos said to pertain to the July 15th and 16th incident were released this summer by filmmaker Jeremy Corbell. The materials consisted of footage of radar screens showing multiple unknown contacts, video of an object apparently falling into the ocean, and a brief video of a triangular-shaped light flying over the deck of a ship. The apparent triangular shape of the object has been strongly debated, as many have posited it was the result of a common optical artifact.