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Since that time, social security numbers have become the de facto military service number for United States armed forces personnel. Beginning in 2002, the military began a further effort to protect the use of social security numbers, even within the military itself.
State Geographical Codes were used as the first two numbers of an Army or Air Force enlisted service number to indicate where a soldier had entered the U.S. military. For instance, the service number "12 345 678" would have a geographical code of 12 and a personal identification number of 345,678.
The term "serial number" is often seen as a synonym of service number; however, a serial number more accurately describes manufacture and product codes, rather than personnel identification. In the Canadian military, a "serial number" referred to a unique number assigned each unit that mobilized for the Second World War.
These numbers are located on the aircraft tail, so they are sometimes referred to unofficially as "tail numbers". On the Northrop Grumman B-2 Spirit bomber, lacking a tail, the number appears on the nose gear door. Individual agencies have each evolved their own system of serial number identification.
The B service number series was issued from 1965 to 1971. In 1969, the Navy further activated a "D series" which reset service numbers to 10,001 to 99,999 (there was never a "C series" created). In 1972, Navy service numbers were discontinued upon the Navy formally abolishing the use of military service numbers in favor of Social Security numbers.
During the early part Second World War, the Marine Corps extended their enlisted service numbers to the number one million with numbers broken down into sub-sections reserved for particular groups enlisting during World War II. The first group, ranging numbers 350,000 to 670,899, were standard Marine Corps enlistees joining for wartime service.
Serial numbers are located on the tail and identify a specific aircraft. For example, MH-53M Pave Low IV serial number 68-10357 was the Pave Low which carried the mission commanders during the Sơn Tây raid. For more information on serial numbering of military aircraft, see United States military aircraft serial numbers.
Prior to Revision R, a container label would require up to ten linear bar codes for NSN, Contract, CLIN, CAGE, shipment number and up to five serial numbers. [3] The PDF417 is a very dense machine-readable symbol that may easily contain the data of those barcodes, plus five full-length IUIDs (Item Unique Identifiers). [2]