- Defense Health Agency (DHA)

 - Walter Reed National Military Medical Center (WRNMMC) and remote sites

 - Affiliated delivery through ATL, a PSI company, as part of the Napakiak Ventures joint venture

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 - WRNMMC is the world’s largest military hospital supporting roughly a million beneficiaries a year.

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 - The Integrated Referral Management and Appointing Center (IRMAC) uses the hospital voice system for nationwide appointment scheduling and patient-status communications.