See the following -

VistA as an EHR System Core for DoD

Here is a copy of the full text of the proposal submitted by the US Department of Veterans Affairs (VA) to the Department of Defense in response to the Request for Information for an electronic health record (EHR) solution that can replace the existing DoD EHR system. This is the approach that makes the most sense as the current core EHR that the Department of Defense (DoD) uses is based on a 30-year-old version of VistA. The current EHR crisis facing DoD stems from the inability to upgrade this older version of VistA. What the VA is proposing is basically an upgrade to DoD's existing core EHR. Read More »