The Defense Department should have all of its data on cloud storage services within five years, the department’s chief information officer told House members on Tuesday. That transition and the advent of Windows 10, he suggested, should help to keep foreign hackers out in the future.

“In five years I am hopeful that we’ll be in an almost complete virtual cloud environment,” Terry Halvorsen told members of the House Armed Services Committee. “We’ll have private clouds which are completely private within segments of DoD. We’ll have private clouds that are just DoD. We’ll have private clouds [with] other parts of the federal government.”