“It was very quickly noticed and email recall procedures were implemented to reduce the number of accounts that received it,” said Marine Forces Reserve Spokesman Maj. Andrew Aranda in a command release.The email was reportedly sent within the usmc.mil official unclassified Marine domain but was also received by some civilian accounts. “The Marine Corps takes the protection of individual Marines’ private information and personal data very seriously, and we have steps in place to prevent the accidental or intentional release of such information,” said Aranda. In this case, officials said they believe the breach was a mistake and "no malicious intent was involved." Meanwhile, the Marine Corps said it has launched an investigation and is working to notify individuals affected. “We…will make any required changes to better safeguard how we collect and store data to prevent this incident from happening again,” added Aranda. On average, DTS processes more than 25,000 transactions and has roughly 100,000 unique users. It operates at over 9,500 total sites worldwide, states the Defense Travel Management Office website.