"Military personnel who complete advanced cyber training - which may take a year or more and costs [the Department of Defense] hundreds of thousands of dollars - may not remain in the military for a significant time after training," the report said.
GAO investigators discovered that two of the four US military services were not positioned to ensure any adequate return on their investment in advanced cyber training, the report said.
"While the Navy and Air Force require three years of active duty, the Marine Corps has no guidance for this area and Army guidance does not clearly define active duty service obligations," the report added.
Army officials told the investigators they lacked the information needed to calculate and implement service obligations for the necessary cyber training because it was not specifically listed in Army guidance, according to the report.