 The U.S. Public Health Service Commissioned Corps and the National Oceanic and Atmospheric Administration Commissioned Officer Corps exclusively use a DCO program to commission their officers.Depending on the specialization and duty-status of the officer, "DCOs" as they're called, will attend either Officer Indoctrination School (OIS), Officer Development School (ODS), or Direct Commission Officer School (DCO School) which vary from two weeks duration for certain Reserve DCOs to five weeks duration for Active Duty DCOs.Active United States Army direct commissions are available in the medical, legal, chaplain corps, and cyber as of November 2017.