. . . and serving on active duty shall be deemed to be commissioned officers of the Regular Corps.
Question: The “Regular Corps (or Corpse as Hussein Obama would say) are they talking about?
They’re talking about the Regular Corps of the Public Health Service Commissioned Officer Corps. It is the second smallest of the seven uniformed services (only the NOAA Corps is smaller) and has existed as a uniformed service since 1871 (it was the Marine Hospital Service until 1912).