The following is provided by lemonelephant, the mom of a Sailor.

The standard Recruit Petty Officer Positions are:

Recruit Chief Petty Officer (RCPO): The RCPO is the primary recruit assistant to RDCs and is responsible for:

1. Maintaining good order, discipline, and security within the division at all times.
2. Ensuring compliance with standing orders and regulations.
3. Assisting RDCs with implementation of schedules.
4. Reporting any abnormal condition to RDCs, including violations of good order, discipline and security, when RDCs are not present.

Recruit Leading Petty Officer (RLPO): The RLPO is responsible to the RCPO and RDCs for:

1. Assisting the Recruit Chief Petty Officer.
2. Ensuring compliance with standing orders and regulations.
3. Assuming duties as Recruit Chief Petty Officer when required.

Recruit Master-at-Arms (RMAA or RMA): The RMAA is responsible to the RCPO and RDC's for:

1. Configuration and cleanliness of division spaces.
2. Procurement, proper stowage and use of all cleaning gear required by the division.
3. Supervision of the division in the absence of RDC's, RCPO or RLPO.

Port and Starboard Watch Section Leaders (PWSL/SWSL): The PWSL and SWSL are the senior Recruit Petty Officers for respective watch sections.

1. The Starboard Watch Section Leader (SWSL) shall serve as the division's watchbill coordinator. Watchbills will be prepared and subsequently submitted to the RDCs via the RCPO.
2. The Port Watch Section Leader (PWSL) shall coordinate the rotation of the ship watchstanders with the RDCs.

Recruit Yeoman (YN): The Recruit YN is responsible to RDCs for:

1. Performing general clerical duties in the division and assisting RDCs with preparation and maintenance of divisional reports, records, class attendance rosters, mail pick-up and distribution.
2. Coordinating with the Medical YN, Education Petty Officer, Athletic Petty Officer and Religious Petty Officer to ensure compliance with special schedule events.
3. Attending the Mail Orderly, Medical/Dental, BMO/Testing and Physical Fitness Testing briefings.

Recruit Medical Yeoman (MYN): The MYN is responsible to RDCs for:

1. Assisting the RDCs in preparing and maintaining recruit medical documentation.
2. Coordinating appointments with the Medical Liaison.
3. Tracking the status of all special physicals.
4. Attending the medical/dental brief.

Recruit Dental Yeoman (DYN): The DYN is responsible to RDCs for:

1. Assisting the RDCs in preparing and maintaining recruit dental documentation.
2. Coordinating appointments with the Dental Liaison.
3. Tracking the status of all special physicals.
4. Attending the medical/dental brief.

Recruit Section Leaders (SL): Each SL is responsible to the respective Watch Section Leader for:

1. Supervise and assisting the recruits in respective sections.
2. Monitoring personal cleanliness, military appearance, clothing
   care and watch standing for recruits assigned to respective sections.

Division Laundry Petty Officer (LPO): The LPO is responsible to the RMAA and RDCs for:

1. Executing proper laundry handling procedures.
2. Maintaining the Cash box and division expense log.

Recruit Education Petty Officer (EPO): The EPO is responsible to the RDCs for:

1. Assisting RDCs in administering and mustering night study and mandatory night study classes.
2. Attending a BMO/Testing brief.

Recruit Athletic Petty Officer (APO): The APO is responsible to RDCs for:

1. Assisting RDCs with Physical Readiness Training.
2. Providing non-participation or substandard performance documentation to the Recruit Medical Yeoman.
3. Attending a Physical Fitness Testing brief.

Recruit Religious Petty Officers (RPO): There will be at least a Catholic and Protestant RPO appointed for each division. If a division has three or more recruits of the same religion, a religious petty officer shall be appointed to represent that faith. RPOs are responsible for:

1. Ensuring all recruits who desire to pray are afforded such an opportunity at tattoo.
2. Attend mandatory meetings at the Chaplain's Office Thursdays at 1900 commencing on the first Thursday following 1-2 DOT (Day of Training) and continuing until graduation, with the exception of FAST Cruise and Recruit Reception Night.
3. Report to the chapel each Sunday 30 minutes prior to the scheduled service to serve as a chapel assist or usher.
4. Ensure all personnel desiring to attend divine worship services are aware of location and time of services.

Recruit Mail Petty Officers (MPO): The MPO is responsible for:

1. Pick-up and delivery of all mail. Designation as MPO includes special qualifications at mail orderly orientation and custody of a mail orderly card.

Recruit Damage Control Petty Officer (DCPO): The DCPO is responsible to the RMAA for:

1. Correcting any fire hazards.
2. Maintaining division fire extinguishers, to include proper location and working order.
3. Assisting RDCs with minor repair and general maintenance of the compartment.
4. Documenting any material discrepancies on the MDCOL that cannot be corrected.