Aviation Material Offices in Norfolk and San Diego, FREQUENCY OF DEMAND— The number of times an item is requested during a specific period of time regardless of the quantity requested or issued. GLOBAL TRANSPORTATION NETWORK (GTN) SYSTEM— A command and control system that provides the U.S. Transportation Command and its components with integrated and automated support to plan, provide, and control common user airlift, surface lift, and terminal services that deploy and sustain the DOD forces on a global basis during peacetime and war. GOVERNMENT BILL OF LADING— A transporta- tion contract between a commercial carrier and the U.S. Government. The Standard Form 1103 provides delivery instructions to the carrier, while the Standard Form 1103B serves as a receipt document for the consignee. GOVERNMENT FURNISHED EQUIPMENT (GFE)— Equipment selected and furnished by the government to a contractor or government activity for installation in, use with, or in support of the aeronautical system during production, conversion, or modification. HAZARDOUS MATERIALS INFORMATION SYS- TEM— A system that provides accurate, com- plete information to both fleet and shore personnel on the procurement, use, transporta- tion, handling, storage, and disposal of hazard- ous materials. HUB— A Navy-operated facility that processes DLR and provides verification of drawing/part number to NSN, corrects erroneous documents, makes the MRIL inquiry to determine the DOP/DSP, and to cut off carcass tracking. Also prepares and submits Reports of Discrepancy (ROD)/Transportation Discrepancy Reports to cut off carcass tracking. Repacks material for shipment. ILLUSTRATED PARTS BREAKDDOWN— A list prepared by the manufacturer for each model aircraft, engine accessory, electronic equipment, or support equipment (SE). IMPREST FUND— A simple, economic purchase method used for small purchases. The imprest fund is a cash fund for which small payments are made at the time of purchase from a commercial vendor. INTEGRATED LOGISTICS OVERHAUL (ILO)— A concerted effort of assigned shipboard personnel, under the supervision of an ashore-based ILO team, to refine shipboard inventories of repair parts, update related stock records consistent with authorized allowances or other stockage objective criteria, and identify material or excess stock. INTERCHANGEABLE ITEM— A nonequivalent item used in place of another item in all applications. INTERMEDIATE LEVEL OF INVENTORY— An inventory, regardless of funding source, required between the consumer and wholesale levels of inventory for support of a defined geographic area or for tailored support of specific consumer organizations or activities. INTERMEDIATE MAINTENANCE ACTIVITY— Any aviation activity (ship or station) authorized to provide intermediate level maintenance support. It consists of the intermediate main- tenance department, the supply department, the weapons department, the public works depart- ment, and the engineering department. INVENTORY CONTROL POINTS— The primary support activities of the Naval Supply Systems Command, bureaus, systems commands, and offices exercising inventory control over specific categories of material. LEAD TIME— A composite of production, adminis- trative, spares positioning, and shipping time. LOGISTICS APPLICATIONS OF AUTOMATED MARKING AND READING SYMBOLS— A system designed to improve the accuracy and productivity of the receipt and stowage process. It is a system used by SUADPS-RT activities to record incoming transactions by reading bar- coded symbols. LOOK-BACK PERIOD— The period of time in the past history of the item being researched during AI-4