The inert missile did not contain any explosives, the Journal reported, but there are concerns that Cuba could share the technology with potential U.S. adversaries like North Korea or Russia. 
 
 The Journal report was attributed to anonymous "people familiar with the matter." A U.S. official with knowledge of the situation, who wasn't authorized to speak publicly on the matter and demanded anonymity, confirmed its veracity to The Associated Press. 
 
 According to the Defense Department, the Hellfire is a laser-guided, air-to-surface missile that weighs about 100 pounds. It can be deployed from an attack helicopter like the Apache or an unmanned drone like the Predator. It is manufactured by Lockheed Martin. The Hellfire training missile contains an incomplete guidance section and has no operational seeker head, warhead, fusing system or rocket motor. 
 
 The U.S. official told the AP that Lockheed was authorized to export the dummy missile for a NATO training exercise. The official attributed the shipping error to Lockheed's freight forwarders, and said the U.S. was working with Lockheed to get the device back. 
 
 The official said the U.S. doesn't want any defense technology to remain in a proscribed country, whether that country can use it or not. The official said there is greater concern that Cuba could give more technically advanced countries access to the dummy. 
 
 According to the Journal report, the missile was properly shipped to Spain, where it was used in the training exercise. It was then taken on a somewhat roundabout journey through Spain, Germany and France before winding up at Charles de Gaulle Airport in Paris. From there, it was supposed to have been shipped back to Florida; instead, it was loaded onto an Air France flight to Havana. 
 
 U.S. officials have been urging the Cuban government to return the missile, the Journal's sources said. The U.S. and Cuba restored diplomatic relations in July 2015 after more than 50 years of hostility. 
 
 The Journal reported that the U.S. is also investigating whether the missile's disappearance was a deliberate act of espionage. ||||| An inert U.S. Hellfire missile sent to Europe for training purposes was wrongly shipped from there to Cuba in 2014, said people familiar with the matter, a loss of sensitive military technology that ranks among the worst-known incidents of its kind. 
 
 The unintended delivery of the missile to Cuba has confounded investigators and experts who work in a regulatory system designed to prevent precisely such equipment from falling into the wrong hands, said those familiar with the matter. 
 
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– A Hellfire missile sent to Europe for a NATO training exercise ended up in Cuba, and authorities aren't sure whether to blame spies, criminals, or incompetent shippers. Sources tell the Wall Street Journal that the inert missile was clearly marked as sensitive cargo when Lockheed Martin sent it to Europe from Florida in 2014, but after it was used in a training exercise in Spain, it ended up among other cargo on an Air France flight from Paris to Havana when it was supposed to be on a flight from Frankfurt, Germany, to the US. Cuban officials seized the missile when it arrived and they realized what it was, the Journal's sources say. A US official tells the AP that while authorities aren't too worried about Cuba reverse-engineering the Hellfire to create its own drone-based missile program, they suspect Havana may have shared the unexpected find with other countries. According to the Journal, American authorities have been asking Cuba, without success, to return the dummy missile and have been examining the paper trail in Europe to try to determine how it went so badly astray. A federal official says Lockheed Martin and other companies have been cited for export-control violations in the past. "This is a complicated business, mistakes are inherent in complicated businesses," the official says. "Mistakes are a part of any human endeavor. Mistakes are made." (Another dummy Hellfire landed on a Texas town.)