Helmet Mounted Sight 
Health Maintenance System 
Her Majesty's Ship 
His/Her Majesty's Ship 
His Majesty's Ship 
Hungarian Meteorological Service 
Hanford Meteorological Station 
Hanford meteorology surveys 
Hardware Maintenance System 
Harvard Medical School 
Hazard Mapping System 
High-performance Management System 
Highway Mobile Source 
His/Her Majesty's Ship/Submarine 
History Memory System 
Hydrocarbon Monitoring System 
Hydrological and Meteorological Statio… 
Hagerman Municipal Schools 
haim munk syndrome 
hairless mouse skin 
Hale Middle School 
Hall Middle School 
Hamburg Middle School 
Hamilton Middle School 
Hanford medical scheduling 
Hanford Meteorological System 
Hanford Meteorology Survey 
hanging my self 
Hanshaw Middle School 
hapten-modified self