Gamma Ray Spectrometer 
Generic Requirements 
Great Red Spot 
Gamma-Ray Source 
general records schedule 
general records schedules 
GENERALIZED RETRIEVAL SYSTEM 
Geodetic Reference System 
Gas Release System 
General Reconnaissance School 
Generic Recording System 
Geometric Radiating Surface 
Geophysical Research Satellite 
Geoscience and Remote Sensing 
Global Reference System 
Global Registered Share 
Graves Registration Service 
Growth/Reservoir System 
Galvanized rigid steel 
Gamma-Ray Scattering 
Gamma-Ray Spectrometer 
Gamma-Ray Spectrometry 
Gamma-Ray Spectroscopy 
Gamma-Ray Spectrum 
Gamma-ray subtraction 
Gammon Lake Resources, Inc. 
Gender reassignment surgery 
General Radio Service 
General record schedule 
General Reference System