- G1 (Assistant Chief-of-Staff, Personnel)
- G-1 (Army or Marine Corps Component Manpower or Personnel Staff Officer (Army Division or Higher Staff, Marine Corps Brigade or Higher Staff))
- G10 (Group of 10 (G7 + Belgium, Netherlands, Sweden, Switzerland; numbering 11 in fact))
- G11N (Globalization)
- G15 (Group of 15 (subset of G77, formed 1989: Algeria, Argentina, Brazil, Chile, Egypt, India, Indonesia, Jamaica, Kenya, Nigeria, Malaysia, Mexico, Peru, Senegal, Sri Lanka, Venezuela and Zimbabwe; currently numbers 17))
- G18 (Glock pistol model 18)
- G2 (Assistant Chief-of-Staff, Intelligence)
- G-2 (Army or Marine Corps Component Intelligence Staff Officer (Army Division or Higher Staff, Marine Corps Brigade or Higher Staff))
- G20 (Group of 20 (G8 + Argentina, Australia, Brazil, China, India, Indonesia, Mexico, Saudi Arabia, South Africa, South Korea, Turkey + current European Union presiding country) (1999))
- G24 (Group of 24 (subset of G77, formed 1971: Algeria, Argentina, Brazil, Colombia, Côte d'Ivoire, Democratic Republic of the Congo, Egypt, Ethiopia, Gabon, Ghana, Guatemala, India, Iran, Lebanon, Mexico, Nigeria, Pakistan, Peru, Philippines, South Africa, Syria, Sri Lanka, Trinidad and Tobago and Venezuela))
- G2B (Government to Business)
- G2 SEC (Intelligence Section)
- G3 (many, including Heckler & Koch G3; see entry|| Assistant Chief-of-Staff, Operations and Plans)
- G-3 (Army or Marine Corps Component Operations Staff Officer (Army Division or Higher Staff, Marine Corps Brigade or Higher Staff))
- G3A (Air Operations Element of the G3 Section)
- G3 OPNS (Current Operations Element of the G3 Section)
- G3 PLANS (Plans Element of the G3 Section)
- G4 (Generation Four PowerPC microprocessor|| Assistant Chief-of-Staff, Logistics)
- G-4 (Army or Marine Corps Component Logistics Staff Officer (Army Division or Higher Staff, Marine Corps Brigade or Higher Staff))
- G4P (GUI for Processing)
- G5 (Generation Five PowerPC microprocessor|| Assistant Chief-of-Staff, Public Affairs)
- G6 (Assistant Chief-of-Staff, Information Technology|| Group of 6 (France, Germany, United States, Japan, United Kingdom, Italy) (1975))
- G-6 (Army or Marine Corps Component Command, Control, Communications, and Computer Systems Staff Officer)
- G7 (Assistant Chief-of-Staff, Training|| Group of 7 (G6 + Canada) (1976))
- G-7 (Information Operations Staff Officer (ARFOR))
- G77 (Group of 77 (issued from the United Nations Conference on Commerce and Development, 1964; currently numbers 133))
- G8 (Assistant Chief-of-Staff, Finance|| Group of 8 (G7 + Russia) (1998))
- G8R (Gator (University of Florida))
- G9 (Assistant Chief-of-Staff, Civil-Military Co-operation (CIMIC))
- Ga (Gallium||Gigaannum)
