The United States is at risk of falling behind its enemies in the field of cybersecurity, military leaders said this week.

The comments come after an unclassified server of the Pentagon’s Joint Chiefs was penetrated this month by a state-affiliated hacker believed to be Russian or Chinese. That incident, Defense Secretary Ash Carter told Defense One, “is evidence that we’re not doing as good as we need to do in job one in cyber, which is defending our own networks.