However, having the same systems throughout means security pros will know the potential entry points. With different systems, those weaknesses are much more difficult to tract and monitor.
"I'd rather defend against a few knowns than defend against all the unknowns," Gula said.
The most difficult barrier the Pentagon is likely to face is the army of employees comfortable with the old computer systems, but who now have to march to something new.
"People as a species don't like change," Gula said. "They don't like to learn new things."
The Pentagon also will struggle to find enough experts to make the technical changes, administer the new systems and train employees to use them.
"That remains one of the bigger challenges," Brazil said.
Pentagon officials told National Defense that the transition will not require additional funding from Congress, but would come out of the Defense Department's cybersecurity budget.
Sign up for CIO Asia eNewsletters.