• G-1 (Personnel) - Personnel and administration section of the general staff or principal staff officer heading that activity in a division or higher command.
• G-2 (Intelligence) - Intelligence section of the general staff or principal staff officer heading that activity in a division or higher command. G-2 is responsible for the Production of Intelligence; Counterintelligence; Intelligence Training for all Staff Members.
• G-3 (Operations & Training) - Operations and training section of the general staff or principal staff officer heading that activity in a division or higher command.
• G-4 (Logistics, Supply, Construction) - Supply and maintenance section of the general staff or principal staff officer heading that activity in a division or higher command.

Regiment Level

• S-1 (Personnel) - S-1 is the regiment's principal staff officer for all personnel matters, including planning and supervision of matters of procurement, classification, assignment, pay, promotion, transfwe, retirement and discharge, decorations, citations, honors, awards, religious, recreational, welfare, postal service, morale, stragglers, and collection and disposition of POW s.
• S-2 (Intelligence) - S-2 is the regiment's principal staff officer for all matters dealing with military intelligence, including collection, evaluation, interpretation, and distribution of information about the enemy.
• S-3 (Operations) - S-3 is the regiment's principal staff officer for all matters dealing with operations and training, including organization, training, and combat operations.
• S-4 (Logistics) - S-4 is the regiment's principal staff officer for all matters dealing with logistics, including supply support.

G-1 Division

313th FA Bn
Thanks to Jeff Wignall