A quick-thinking store clerk in rural New Mexico stopped a former Navy SEAL from carrying out what federal prosecutors called a planned explosives attack on law enforcement officers at a "No Kings" protest in San Diego, and a jury just convicted him.

Gregory Vandenberg, 49, walked into a travel center near Lordsburg, New Mexico, on June 12, 2025, bought six mortar-style fireworks and 72 M-150 firecrackers, and openly told the clerk behind the counter that he planned to throw them at police during upcoming demonstrations in California. He asked repeatedly about the gunpowder content. He asked whether taping multiple mortars together would increase the blast. He said he had no interest in the color or display of the fireworks, only in their ability to create explosions and injure officers, Fox News reported.

Then he encouraged the clerk to come along and hand out fireworks to others at the protest, assuring the employee he would not get hurt because of his own military experience.

The clerk did not go along. Instead, store employees wrote down Vandenberg's license plate number and called law enforcement before he could cross into California. Federal agents tracked him to Davis-Monthan Air Force Base in Tucson, Arizona, and arrested him the following morning, June 13, while he slept in his vehicle, one day before the planned June 14 demonstrations.

Agents found extremist clothing and a phone full of violent content

A search of Vandenberg's vehicle turned up far more than fireworks. AP News reported that investigators recovered shirts bearing an Al-Qaeda flag, a shirt calling for the destruction of Judea, a hat featuring the Al-Qaeda flag, and apparel displaying a variation of the Black Sun, a symbol associated with neo-Nazi ideology.

His cellphone home screen displayed a Taliban flag. A forensic review uncovered violent extremist content, including antisemitic, anti-Israel, and anti-U.S. material, along with messages discussing the upcoming protests.

When agents questioned Vandenberg, he falsely claimed he was traveling for work, despite being unemployed. He later changed his story, saying he was visiting friends in Phoenix. Inside the travel center, surveillance had captured him wearing a custom-made T-shirt bearing the word "AMALEK." He told investigators the word meant "destroyer of Jews."

Prosecutors argued that Vandenberg believed the U.S. government, including President Donald Trump, was controlled by Israel and Jewish people, and that this belief helped establish his motive for targeting law enforcement at the protest. The case is a stark reminder that threats against U.S. security can come from unexpected corners, including from individuals with elite military training.

Five-day trial ended with a three-hour jury deliberation

Vandenberg's federal trial lasted five days. The jury needed roughly three hours to return guilty verdicts on both counts: transportation of explosives with intent to kill, injure, or intimidate, and attempted transportation of prohibited fireworks into California. The New York Post reported the same outcome, noting the speed of the deliberation after a week of testimony.

The court sentenced Vandenberg to 16 months in federal prison. Upon release, he will serve one year of supervised release. He remains in custody. Newsmax confirmed the sentence and noted that Vandenberg could have faced up to 10 years behind bars.

That gap between the maximum possible sentence and the 16 months actually imposed is one of the unanswered questions hanging over the case. Prosecutors have not publicly explained why the sentence landed where it did, and the court filings that might shed light on the reasoning have not been made available.

The case also raises questions about how a former SEAL, someone trained and vetted at the highest levels of the U.S. military, ended up homeless, radicalized, and driving across the Southwest with a vehicle full of extremist paraphernalia and explosives. The record so far does not answer when Vandenberg separated from the Navy, under what circumstances, or whether any warning signs surfaced along the way. Ongoing concerns about the conduct and accountability of current and former military personnel make those gaps worth filling.

Acting U.S. Attorney: free speech does not extend to explosives

Acting U.S. Attorney Ryan Ellison, whose office in the District of New Mexico prosecuted the case, issued a statement after the verdict. Ellison drew a clear line between protected speech and criminal conduct:

"People in this country are free to hold their own beliefs and to express them peacefully. What they are not free to do is use explosives to threaten or terrorize others."

Ellison added that Vandenberg "intended to turn explosives into a tool of intimidation" and said the verdict "sends the message that attempts to substitute violence for expressing one's opinion has no place in our communities and will be met with federal consequences."

Those are the right words. But the sentence, 16 months for a man who purchased explosives, told a stranger exactly how he planned to use them against police officers, and was caught with a car full of extremist gear, will leave many wondering whether federal consequences matched the federal rhetoric. Insider threats to national security, whether from intelligence officials or former special operators, demand a response proportional to the danger.

A store clerk did what the system could not

The real hero of this story is not a federal agent, a prosecutor, or a judge. It is an unnamed store clerk at a travel center in a small New Mexico town who listened to a customer describe his plan to hurt police officers, and did something about it.

That clerk wrote down a license plate. That clerk picked up the phone. And because of that, Vandenberg never made it to San Diego. No officers were hurt. No fireworks were launched into a crowd. The plot died in a parking lot in Tucson before it could become a headline about casualties.

Vandenberg was not subtle. He wore his ideology on his shirt. He volunteered his plans to a stranger. He asked technical questions about maximizing damage. Every detail of this case suggests a man who had abandoned any pretense of concealment, and yet the system only caught him because a civilian did the right thing at the right moment.

Federal law enforcement tracked him quickly once the tip came in. That part worked. But the tip had to come first. Without it, a radicalized former SEAL with a vehicle full of explosives and extremist material would have arrived in San Diego on June 14 with a plan and the training to execute it.

The conviction is the right outcome. The sentence is debatable. But the lesson is plain: when someone tells you they plan to hurt people, believe them, and call it in.