In breach notification letters sent to impacted individuals earlier this month, FMG said that some of its systems had been infiltrated by threat actors between Apr. 6 and Apr. 12, resulting in the exfiltration of files with personal data, including names and Social Security numbers. The United States Naval Institute, which was immediately notified by FMG regarding the incident, previously noted that the firm's servers catering to cutting, welding, and other machines used for shipbuilding had been taken offline after the attack. Such an incident comes a month after a separate cyberattack since claimed by a ransomware operation was confirmed by fellow U.S. Navy shipbuilder Austal.