S4 (military)

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In the modern United States Army and several other militaries with similar structures, the S4 is an officer who manages the battalion's logistical support, aided by the S4 section and specialized platoons (support, maintenance) organic to the headquarters and headquarters company (HHC).

Battalion logistical support is provided by the support and maintenance platoons under the supervision of the S4. The S4 section is responsible for providing ammunition, fuel, food, water, maintenance, and transportation services to the companies. The battalion supply sergeant locates in the field train's command post (CP), acting as section sergeant for the company supply sergeant and also assists the HHC commander in monitoring the administrative and logistics (A & L) radio net during the preparation and execution phases. He assists the S4 in getting needed supplies forward and may, at times, move up to the combat train's CP to provide assistance in specific areas. The HHC commander and the support platoon leader locate in the battalion field trains and respond to the forward units' support requirements. Significant differences in logistical capabilities exist between light and heavy battalions.

Logistics officers at division level and higher are referred to as "G4," and at joint commands, "J4."

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In the modern United States Army and several other militaries with similar structures, the S4 is an officer who manages the battalion's logistical support, aided by the S4 section and specialized platoons (support, maintenance) organic to the headquarters and headquarters company (HHC).

Battalion logistical support is provided by the support and maintenance platoons under the supervision of the S4. The S4 section is responsible for providing ammunition, fuel, food, water, maintenance, and transportation services to the companies. The battalion supply sergeant locates in the field train's command post (CP), acting as section sergeant for the company supply sergeant and also assists the HHC commander in monitoring the administrative and logistics (A & L) radio net during the preparation and execution phases. He assists the S4 in getting needed supplies forward and may, at times, move up to the combat train's CP to provide assistance in specific areas. The HHC commander and the support platoon leader locate in the battalion field trains and respond to the forward units' support requirements. Significant differences in logistical capabilities exist between light and heavy battalions.

Logistics officers at brigade level and higher are referred to as "G4," and at joint commands, "J4."

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