What does IOHS stand for?

Insufficient Operator Head Space (US Navy, wetware)

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Internet Online Hong Kong Input-Output Hidden Markov Model In Our Humble (or Honest) Opinion Illinois Oral Health Plan (est. 2001) International Order of Horror Professionals Iranian Oral History Project (Harvard University; Boston, MA) International Order of Human Rights International Organization of Heterosexual Rights Subcommittee on International Operations and Human Rights (US House of Representatives) Iraqi Organization for Human Rights Coordination		Integrated Occupational Health Services (est. 1994; St. John's, Newfoundland, Canada) International Occupational Hygiene Society Institute of Occupational Hygienists of Southern Africa (now Southern African Institute for Occupational Hygiene) Industrial, Occupational Health and Safety Management (course; Kafue Gorge Regional Training Centre; Zambia) Institute of Human Thermodynamics Identity of Interest In Orbit Infrastructure Independent Opportunities, Inc. (Tulsa, OK) Indian Ocean Islands Indication of Interest