HALO		High Altitude Lift-Off
HARP		High Altitude Research Project
HATV		High Altitude Test Vehicle
HCMM		Heat Capacity Mapping Mission
HEAO		High Energy Astronomy Observatory
HEOS		Highly Eccentric Orbit Satellite
HF		High-Frequency
HFE		Heat Flow Experiment
HIMES		HIghly Manoeuvrable Experiment Space
HIRS		High-Resolution Infrared Sounder
HIVOS		HIgh Vacuum Orbital Simulator
HLLV		Heavy-Lift Launch Vehicle
HOF		Human Otolith Function
HOPE		H-II Orbiting Plane Experiment
HRIR		High Resolution Infrared Radiometer
HRV		Haute Resolution Visible
HSV		Herpes Simplex Virus
HTP		High Test Peroxide
HTV		Hypersonic Test Vehicle
HUT		Hopkins Ultraviolet Telescope
HVAR		High Velocity Aircraft Rocket
HYFLEX		HYpersonic FLight EXperiment