. Materials that are likely to cause fires due to friction, absorption of moisture, spontaneous chemical changes, or as a result of heat retained from manufacturing or processing. . Ammunition and explosives. l Containers previously used for shipping high explosives, such as dynamite. . Intoxicating liquors. . Items subject to damage from freezing and permanently magnetic materials with unconfined fields are not mailable by air shipment. . Radioactive, combustible, gaseous liquid, perishable material, and items subject to plant quarantines are either unmailable or subject to special mailing conditions. Detailed information on these categories may be obtained from local postal authorities. Military Official Mail (MOM) MOM is a special procedure approved by the USPS for providing air transportation of official mail addressed to or from a military post office. It is handled as third- or fourth-class mail at a cost cheaper than priority mail. Refer to Navy Official Mail Management Instructions, OPNAVINST 5218.7, for additional details. MOM is the normal means of mailing official parcels that require airlift to overseas destinations not included in the domestic postal systems. It is also used for mailing official parcels that do not meet the criteria for priority or first-class mail. Mail that has a critical date of delivery may be sent by MOM on a piece- by-piece basis. Under no circumstances may both MOM and first class be marked on the same package. However, markings such as third-class MOM, controlled circulation MOM, and third-class bulk rate MOM are authorized if such mailings have a required delivery date and are addressed to an overseas activity. Express Mail Service Express Mail Service (EMS) is an overnight service developd by the USPS, and is available between designated post offices in CONUS and to some points served by international mail. Any mailable matter, properly prepared, can be moved by EMS. At this time EMS is not available for APO/FPO addresses, but can be used to quickly ship material to CONUS APO/FPO fleet forwarding post offices for normal service beyond. Three basic services are offered by EMS. They are sameday airport service, custom-designated service, and next-day service. EMS is a premium means of moving mail, and specific authorization for each case must be requested from the Chief of Naval Operations (Postal Affairs Branch). Weight and Size Limitations Material eligible for all classes of mail, including MOM, is limited to 70 pounds or less and no more than 100 inches in length and girth combined. Individual pieces of third-class mail may weigh up to, but not exceed, 16 ounces, and the total weight placed in one bag may not exceed 70 pounds. Fourth-class mail parcels, including parcels marked Special Fourth-Class Rate, must weight 16 ounces or more and may not exceed 70 pounds or 100 inches in length and girth combined. External Markings The statement “Postage and Fees Paid, DOD-316,” must be professionally imprinted in the upper right comer of all envelopes, labels, tags, or wrappers used to send official mailable matter, including matter sent by any of the special mail services. The statements “Official Business” and “Penalty for Private Use, 0,” must be imprinted in the upper left comer, below the sender’s return address. Markings that show the mail classification or type of special service, when appropriate, must be stamped on the address side of the parcel. The city, state, and ZIP Code must be the last line of the address, and no other information may appear below this line. MILITARY STANDARD TRANSPORTATION AND MOVEMENT PROCEDURES The Military Standard Transportation and Movement Procedures (MILSTAMP), DOD 4500.32-R, provides DOD policy for the transportation and movement of material through the DTS. Volume I contains standard data elements, codes, formats, documents, forms, rules, methods, and procedures. These are information required by DOD activities in the transportation and movement of material to, within, and beyond the DTS. Volume II contains instructions and procedures for applying transportation account codes (TAC) to transportation documents. MILSTAMP policy simplifies the exchange of logistics data between armed services and agencies. Deviation or exemptions may not be approved unless the user shows that MILSTAMP does not provide workable methods or procedures. 7-28