General Circulation Model 
General Court Martial 
global climate model 
Governor Control Module 
Global Circulation Model 
Gas Control Module 
General Clearing Member 
General Council Memorandum 
Generator Coordinate Method 
Geriatric Care Managers 
Global Change Model 
Good Conduct Medal 
greatest common measure 
Ground Control Message 
Gadolinium Calcium Manganate 
Galois Counter Mode 
GCOS Cooperation Mechanism 
General Circulation Models 
General Command of Mapping 
General Council Meeting 
General Counsel Memorandums 
General Court-Martial 
generalized context model 
Generalized Control Model 
GENIE Communication Manager 
germinal cell mass 
Giant cell myocarditis 
glia-conditioned medium 
glial cell missing 
glial cells missing