equipment.  Figure  1-10  shows  a  sample  Equipment Repair Order Log. The types of information generally called for are the following: ERO number (assigned eight-digit number). (The first four digits are two alpha characters and two numeric, such as AA00. The last four digits are numeric and constitute a Job Sequence Number (JSN) which is assigned locally. This JSN  runs  continuously  from  0001  through  9999. At such time as 9999 is used, a new series starts 0001.) Equipment code (six-digit code, as shown on the PM record card). USN  number  (seven  digit  equipment  registration number). Type of repair (type of maintenance performed, such as 01, 02, or 03). Date in (date ERO forwarded to inspector). Date   out   (date   equipment   is   returned   to dispatch). PM group. Hard card number (number issued by dispatch from the hard card log). Remarks (date deadlined, and so on). The EROS and the ERO log are maintained by the PM clerk. Complete instructions on the use of EROS are located  in  the  Management  of  Civil  Engineering Support  Equipment,   P-300,  and  the  COM- SECONDNCB/COMTHIRDNCBINST   11200.1. EQUIPMENT HISTORY JACKETS An  equipment  history  jacket  is  maintained  for  each USN-numbered piece of CESE. The history jacket contains  the  pertinent  descriptive  data  and  maintenance history  of  the  vehicle.  The  descriptive  data  includes  the appropriate DoD Property Record, DD Form 1342 (fig. 1-11),  and  Equipment  Attachment  Registration  Record, NAVFAC 6-11200/45 (fig. 1-12), if applicable. The maintenance  history  jacket  also  includes  the  completed PM record cards and blue copies of completed EROS. When a vehicle is transferred, the PM record card is removed from the PM group file and returned to the history jacket. The jacket is then either hand carried or forwarded by mail to the receiving custodian. When the  vehicle  is  to  be  transferred  to  a  Defense Reutilization Marketing Office (DRMO), the history jacket must accompany it. LABOR REPORTING In battalions and at shore-based activites, your duties involve posting of working hours on time cards for military personnel; therefore, you should know the type of information required in labor reporting. You should  note  that  the  labor  reporting  system  used primarily in Naval Mobile Construction Battalions (NMCBs)  and  the  system  used  at  a  shore-based  activity are  similar. A labor accounting system is mandatory for you to record and measure the number of man-hours that a unit spends on various functions. In this system, labor usage data is collected daily in sufficient detail and in a way that enables the Operations Department to compile the data readily and prepare reports for higher authority. Although labor accounting systems vary slightly from one command to another, the system described here can be tailored to record labor at any command. A unit must account for all the labor used to carry out its assignment. Labor costs are figured and actual man-hours are compared with previous estimates based on jobs of a similar nature. When completed, this information  is  used  by  unit  managers  and  higher commands to develop planning standards. The labor accounting system covered in this section is based upon the procedure and guidelines established by both Naval Construction Brigades (NCBs) for NMCB use. Time  cards  (fig.  1-13)  are  the  basis  for  your situation  report  (SITREP)  input.  Therefore,  it  is imperative that time cards be filled out correctly and accurately.   COMSECONDNCB/COMTHRIDNCB- INST5312.1  is  the  instruction  that  governs  timekeeping procedures. Man-hours should be recorded under a specific code in one of three labor categories. The categories are listed below. 1.  DIRECT  LABOR  is  man-days  expended directly on assigned construction activity, either in the field or in the shop, and labor that contributes directly to the completion of an end product. Tasked projects are assigned  a  project  number.  Labor  expended  on  a specific project should be reported under that project number. Record direct labor by construction activity number. Included   under   direct   labor   (besides construction) arc such tasks as the following: 1-15