Unit Check-In Procedures - S-1 Procedural Page

Role and responsibility

The S-1 clerk receives the inbound Marine at the S-1 and issues the unit check-in sheet per MCO 1300.8MCO 1300.8. Each staff section signs off completion of section-specific actions (S-2 security clearance, S-3 training records, S-4 gear and clothing, Medical health record, Legal awareness, Career Planner counseling, Chaplain optional). The S-1 chief reviews the completed check-in sheet. The S-1 officer signs by direction on completion routing. The unit commander or designated representative meets the inbound Marine.

Source documents flow from the inbound Marine's arrival, the gain notification, the check-in sheet template, the orders package, and the prior unit clearance records. Unit check-in outputs include the issued check-in sheet, the completed staff section sign-offs, the S-4 gear and clothing accountability record, the Medical record routing, the S-1 initial brief record, the chain of command introduction, and the filed check-in sheet in the unit file.

Per MCO 1300.8, unit check-in runs through the unit S-1 and staff sections. The check-in process supports unit accountability and operational readiness for the inbound Marine.

Trigger events

• Inbound Marine arrives at the unit S-1.
• Check-in sheet issuance and routing initiated.
• Staff section sign-off requirement.
• S-4 individual gear and clothing accountability.
• S-1 initial brief schedule.
• Chain of command introduction window.

Processing workflow

1. Receive the inbound Marine. The S-1 clerk welcomes the Marine, confirms identity, and reviews the orders package.
2. Issue the unit check-in sheet. The unit check-in sheet lists every staff section requiring sign-off.
3. Route through staff sections. The Marine routes through:
   • S-1 (personnel administration).
   • S-2 (security clearance, classified material brief).
   • S-3 (training records, T-R event status, qualification brief).
   • S-4 (individual gear and clothing accountability).
   • Medical (health record, immunizations, dental).
   • Legal (legal awareness, will preparation referral).
   • Career Planner (career counseling, EAS and retention).
   • Chaplain (optional, family and personal support).
4. Coordinate gear and clothing accountability. Per MCO 1300.8MCO 1300.8, the S-4 records the individual gear and clothing receipt.
5. Run the S-1 initial brief. The S-1 covers unit administrative procedures, the chain of command, the Marine's responsibilities, and the unit standards.
6. Introduce to the chain of command. The platoon or section sergeant introduces the Marine to the immediate leadership. The unit commander or designated representative welcomes the Marine.
7. Confirm sponsorship handoff. Per MCO 1320.11HMCO 1320.11H, the sponsor designation completes the handoff.
8. Verify completion. The S-1 chief reviews the completed check-in sheet for every staff section sign-off.
9. Return the check-in sheet. The Marine returns the completed sheet to the S-1.
10. File the check-in sheet. The S-1 retains the sheet in the unit file per the records schedule.

Systems of record and forms

Systems

• Unit Check-In File. Holds completed check-in sheets.
• Staff Section Records. Holds section-specific sign-offs.
• Sponsorship Roster. Per MCO 1320.11H.
• MOL. Surfaces inbound notifications and orders.

Forms

• Unit Check-In Sheet. Local format listing every staff section.
• Individual Gear and Clothing Receipt. Per S-4 records.
• S-1 Initial Brief Roster. Local format.
• Chain of Command Introduction Memorandum. Local format.

Common pitfalls

• Check-in sheet not issued at arrival. The S-1 issues the sheet at the first contact.
• Staff section sign-offs incomplete. Per MCO 1300.8MCO 1300.8, every section signs off.
• Individual gear and clothing accountability skipped. Per MCO 1300.8, the S-4 records the receipt.
• S-1 initial brief skipped. The brief covers unit standards and responsibilities.
• Chain of command introduction skipped. The introduction supports unit cohesion.
• Sponsorship handoff not confirmed. Per MCO 1320.11HMCO 1320.11H, the sponsor closes out at the agreed milestone.
• Completed check-in sheet not filed. The unit file retains the sheet per the records schedule.

Decision points

• Check-in cadence. Standard check-in runs within 5 working days of arrival. Operational tempo adjusts the cadence.
• Staff section sequencing. The unit routes the Marine through sections in parallel or sequential order based on staff availability.
• Chaplain optional versus required. Unit policy drives the requirement.
• Medical routing. The Medical sign-off includes garrison physical, sea-duty physical, or deployment physical depending on the assignment.

Authority

This sub-page sits under MCO 1300.8MCO 1300.8 Marine Corps Personnel Assignment Policy. MCO 1320.11HMCO 1320.11H covers Sponsorship. MCO P1070.12KMCO P1070.12K covers OMPF receipt at check-in. MCO 5000.14DMCO 5000.14D covers S-1 check-in responsibilities. The processing workflow maps to NAVMC 3500.3E T-R event 0170-PERA-2104.

Related references

• MCO 1300.8. Personnel assignment and check-in.
• MCO 1320.11H. Sponsorship.
• MCO P1070.12K. OMPF receipt.
• NAVMC 3500.3E. T-R event 0170-PERA-2104.