The S4 is the principal staff officer for coordinating the logistics integration of supply, maintenance,transportation, and services for the command. The S4 is the link between the support unit and his commander plus the rest of the staff. The S4 assists the support unit commander in maintaining logistics visibility with the commander and the rest of the staff. The S4 must also maintain close and continuous coordination with the S3. A logistics officer is located at every echelon of command from battalion through corps. At brigade and squadron levels, the S4 not only coordinates activities but also executes requirements for the commander and unit.
Logistics operations and plans:
Providing information on enemy logistics operations to the S2 for inclusion to IPB. Developing with the S3 the logistics plan to support operations. Coordinating with the S3 and S1 on equipping replacement personnel and units. Coordinating with supporting unit commander on the current and future support capability of that unit. Coordinating the selection and recommending of main supply routes (MSRs) and logistics support areas, in coordination with the ENCOORD, to the S3. Coordinating all classes of supply, except Class VIII (medical), according to commanders priorities. Class VIII is coordinated through medical supply channels. Coordinating the requisition, acquisition, and storage of supplies and equipment, and the maintenance of materiel records. Ensuring, in coordination with the provost marshall, that accountability and security of supplies and equipment are adequate. Calculating and recommending to the S3 basic and prescribed loads and assisting the S3 in determining the required supply rates. Coordinating and monitoring the collection and distribution of excess, surplus, and salvage supplies and equipment.
Conducting operational and tactical planning to support movement control and mode and terminal operations. Coordinating transportation assets for other services. Coordinating with G5 (S5) for host nation support. Coordinating with the S1 and the S3 (PM) on transporting replacement personnel and EPWs. Coordinating special transport requirements to move the command post. Coordinating with the S3 for logistics planning of tactical troop movement.
Coordinating the construction of facilities and installations, except for fortifications and signal systems. Coordinating field sanitation. Coordinating actions for establishing an organizational clothing and individual equipment operation for exchange and for replacing personal field (TA-50) equipment. Coordinating or providing food preparation, water purification, mortuary affairs, aerial delivery, laundry, shower, and clothing and light textile repair. Coordinating the transportation, storage, handling, and disposal of hazardous material or hazardous waste. Coordinating unit spill prevention plans.
Staff planning and supervision:
Identification of requirements and restrictions for using local civilians, EPWs, and civilian internees and detainees in logistics support operations. Battlefield procurement and contracting. Coordination with SJA on legal aspects of contracting. Coordination with the RM officer and the finance officer on the financial aspects of contracting. Real property control. Food service. Fire protection. Bath and laundry services, and clothing exchange. Mortuary affairs.
Staff responsibility for Coordination: