emergency situations, use of government-owned and operated motor vehicles may be authorized for distances beyond 100 miles. Travel of more than 100 miles must have justification. It maybe for security reasons or when the use of such vehicles would be in the best interest of the government. Government vehicles used for transporting freight with excessive dimensions or weight require a state permits. Commercial Trucks Commercial trucks may be leased for exclusive use by the Navy or commercial truck lines maybe used for small shipments within CONUS. The following paragraphs describes the contract truck (CONTRUCK) and the Northeast Dedicated Truck System (NDTS), managed by NAVMTO. Contract Truck CONTRUCK is a commercially operated system. Its purpose is to provide fast, over-the-road delivery at a reduced cost for less than truck load (LTL) transcontinental Navy shipments. CONTRUCK was first established to move LTL shipments between the east and west coasts. It was expanded to include 5 days per week service between Norfolk, Virginia; Charleston, South Carolina; and Jacksonville, Florida. CONTRUCK shipments are combined for movement and distribution at terminals located in Norfolk, Charleston, Jacksonville, and San Diego, Long Beach, and Travis Air Force Base (AFB), California. Shipments eligible for CONTRUCK are for items less than 10,000 pounds. Shipments include direct procurement method shipments of personal property and unaccompanied baggage. Material classified as Confidential or pilferable and general commodity cargo shipments may use CONTRUCK system. Shipments not eligible for CONTRUCK are class A and B explosives, material requiring special handling (such as heater service, electrical connections, refrigerators, or oversize cargo), and metal products over 10 feet in length or over 3,000 pounds per piece. Shipments by Mail The U.S. Postal Service (USPS) regulation governs shipments of all mailable material entered into the postal system, including surface and air parcel post. Mail is the primary and preferred means of moving material to and from ships. Mailable material includes official letters or packages that meet USPS standards according to weight, size, and physical dimensions. The various types of special mail services include registered mail, certified mail, and insured mail. The use of special delivery or special handling offered by the USPS is not authorized for use by the Department of the Navy. All mailable matter in the United States domestic postal system is classified as first, second, third, or fourth class mail, and military official mail (MOM). To determine the class of mail to use for shipping supply parcels, refer to table 7-2. Transportation of Mailable Matter Mail and parcel post matter are transported by USPS equipment and personnel, and by commercial land, sea, and air carriers. Therefore, depending on the class of mail service requested by the shipper, the USPS uses commercial transportation to move mail between post offices. Although the use of mail service reduces shipping documentation costs, material cannot be expedited while it is in the postal system. Matter that must be shipped by traceable means must be sent by registered mail. Some mail is moved with Army Post Office (APO) and Fleet Post Office (FPO) priority. Refer to NAVSUP Publication 1, volume 5, paragraph 52531, for APO and FPO priorities. The domestic postal system is handled according to the following priorities: 1. 2. 3. 4. 5. 6. Airmail: Letter mail, air parcel post, or priority mail parcels weighing 12 ounces and up. Airmail applies to international mail only. First-class: Letter mail and priority mail parcels weighing 11 ounces and under. Second-class: Newspapers and periodicals. Fourth-class: Parcel post. Ordinary papers and third class. Circulars. Unmailable Material Unmailable material includes all material that, by law or regulation, is prohibited from being sent through the USPS. Examples of unmailable matter are as follows: . All kinds of poisons, such as caustics, acids, and alkalies. . Oxidizing materials or flammable liquids and solids. 7-26