answer:For the moment, none as far as I can tell. Here is an excerpt from the US Dept. of Defense Instruction 6130.03 ”Department of Defense Instruction (DoDI) 6130.03”“Medical Standards for Appointment, Enlistment, or Induction in the Armed Forces” provides specific medical standards to ensure those who enlist are medically qualified to perform their military duties. That policy states a current hearing threshold level in either ear greater than: (1) pure tone at 500, 1000, and 2000 cycles per second for each ear of not more than 30 decibels (dB) on the average with no individual level greater than 35 dB at those frequencies; and (2) pure tone level not more than 45 dB at 3000 cycles per second or 55 dB at 4000 cycles per second for each ear, does not meet the medical standard for accession. Q2. Is it possible for deaf people to serve the military in support jobs or non-combat jobs? All military members must be available for worldwide duty 24 hours a day without restriction or delay, and must be “medically adaptable to the military environment without the necessity of geographical area limitations.” This duty may be in remote areas lacking immediate and comprehensive medical support. In other words, there are no exclusively support or non-combat jobs at the entry level that are non-deployable. In all areas of military life, but especially in combat, an individual’s life and the lives of his or her comrades may depend on what individuals can hear. Situations could occur where hearing impairment would not only result in injury or loss of life, but could jeopardize a unit’s mission.