authorization to assign blocks of serial numbers for different  classes  of  material.  Some  examples  of  these material classes are aviation repairable items, ordnance, and  food.  Activities  authorized  to  assign  blocks  of numbers will have this segment subdivided to include separate sections for each material class. The serial numbers in each section run consecutively throughout the fiscal year. As a minimum, the expenditure record log  will  contain  the  following  information: Expenditure  document  number Expending   department Material   disposition Material   identification Remarks EXPENDITURE FILE This file contains the original copies of transaction documents  processed  by  the  activity.  If  the  original  is not  available,  the  activity  may  use  a  copy  of  the transaction  document.  The  transaction  documents referred  to  in  this  section  are  the  forms  used  for  each transfer, cash sale, or survey. The sequence for filing the invoices is Julian date and serial number sequence. The retention period of the expenditure invoice file is 3 years after  completion  of  the  expenditure  transaction. MATERIAL ISSUES The term issue means the process of expending material  in  response  to  a  requisition  from  a  user, supported unit, or activity. Refer to issue processing procedures   described   in   NAVSUP   Publication   1, Volume  2  (shore),  and  NAVSUP  Publication  485 (afloat).   For   mechanized   activities,   refer   to   the publications  and  system  procedures  set. Issues Ashore Naval air stations and other stations under the management  of  Naval  Air  Systems  Command (NAVAIR) use MILSTRIP for internal procedures. The Naval   Aviation   Maintenance   Program   (NAMP) procedures are also mandatory at naval air stations. Document  processing  of  material  issues  at  supply departments ashore generally follows the preposting method.  However,  supply  departments  may  establish the postposting method for issuing material in direct support  of  a  weapons  system.  This  method  is  necessary to  meet  the  time  frame  for  processing  requirements. The chronological order of requisition processing procedures  ashore  may  vary  among  supply  activities. For example, mechanized processing involves different organizational  areas  than  does  manual  processing.  The processing of onstation issues by using the requestor’s requisitions differs from the processing of offstation requisitions. Receipts from offstation may be on DD Form 1348-1, DD Form 1348-1A, or other shipment documents. The processing and routing of requisitions also depend on the setup of the supply organization. Some supply departments carry material in stock while others get material support from the nearest stock point. Supply departments  that  have  material  in  stock  route  copies  of requisitions to either the issue control branch or the stock control branch. The issue control branch reviews the  requisitions  for  proper  MILSTRIP  format  and determines the internal handling precedence. When necessary,  the  issue  control  branch  may  provide expediting services to quicken the processing. The issue control  branch  also  monitors  the  flow  of  issue documents through the issue process and furnishes status to requisitioners. This branch also maintains the requisition history and status file and serves as liaison between  the  supply  department  and  its  customers. In screening the requisition, the issue control branch checks for proper format, completeness of required data, and proper authority. This branch also determines the necessity  for  special  handling.  After  the  screening process,  the  issue  control  branch  forwards  the requisition  to  the  stock  control  branch  for  further processing.  The  issue  control  branch  may  return requisitions  that  have  errors  to  the  originator  for resubmission.  In  some  cases,  the  issue  control  branch can correct the errors on the requisition. The action taken in  handling  erroneous  requisitions  depends  upon  the circumstances  and  local  policy.  For  example,  issue control cannot ensure the correct data to use for the missing information on a requisition. The issue control branch should return the requisition to the originator for correction. When possible, issue control may contact the originator for the required data to correct the requisition. Upon receipt of the requisition, the stock control branch ensures that copies of request forms are intact. The form used may be the DD Form 1348 (6 pt) or DD Form 1149. (For automated activities, refer to the user’s manual.)  The  stock  control  branch  determines  the supply action to be taken on the requisition. If all material is to be issued from stock, stock control sends copies 2, 4, 5, and 6 of DD Form 1348 or 1149 to the storage branch. Copies 7 and 8 of DD Form 1149 may be used locally or destroyed. If the entire requested quantity is issued from stock, the storage branch can discard copy 2. After completing the issue from stock the issue control branch retains and files the proof of delivery copy. 7-2