[Code of Federal Regulations] [Title 42, Volume 1] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 42CFR21.44] [Page 79-80] TITLE 42--PUBLIC HEALTH CHAPTER I--PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES PART 21_COMMISSIONED OFFICERS--Table of Contents Subpart B_Appointment Sec. 21.44 Clinical or other practical demonstration. In the discretion of the Surgeon General a candidate for appointment to any grade up to and including the senior assistant grade in the Regular [[Page 80]] Corps may be required to perform successfully a clinical or other practical demonstration which, if required, shall constitute a part of the professional examination.