
1) Military life
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https://www.crosswordclues.com/clue/service-number

A service number is an identification code used to identify a person within a large group. Service numbers are most often associated with the military; however, they may be used in civilian term as well. Social Security Numbers may be seen as types of service numbers. The term `serial number` is often seen as synonym of service number; however, .....
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http://en.wikipedia.org/wiki/Service_number
[United States Air Force] United States Air Force service numbers were created in the spring of 1948, approximately six months after the Air Force`s creation as separate branch of the armed forces. ==Air Force officer service numbers== The first regulation of Air Force service numbers applied to numbers held by Air Force officers. In 1947, ...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Air_Force)
[United States Armed Forces] Service numbers were used by the United States Armed Forces as the primary means of service member identification from 1918 until 1974. Service numbers are public information available under the Freedom of Information Act, unlike social security numbers which are protected by the Privacy Act of 1974. ==Service n...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Armed_Forces)
[United States Army] Service numbers were used by the United States Army from 1918 until 1969. Prior to this time, the Army relied on muster rolls as a means of indexing enlisted service members while officers were usually listed on yearly rolls maintained by the United States War Department. In the nineteenth century, the Army also used pa...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Army)
[United States Coast Guard] United States Coast Guard service numbers were first created in the later half of 1921. In 2004 the Coast Guard began using Employee Identification Numbers, or EMPLIDs, to replace the Social Security Number on official forms. ==Coast Guard officer numbers== Coast Guard officer service numbers were unique amongst ...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Coast_Guard)
[United States Marine Corps] United States Marine Corps service numbers were created in 1920, the same year as Navy service numbers, and were modeled after the same design. ==Marine Corps officer numbers== The first one hundred Marine Corps officer service numbers were intended for retroactive presentation to World War I veterans; the Marin...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Marine_Corps)
[United States Navy] United States Navy service numbers were created in 1920, one year after the close of the First World War. The creation of Navy service numbers coincided with those of the Marine Corps, as the Marines were under the authority of the Department of the Navy. ==Navy officer service numbers== Navy officer service numbers wer...
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http://en.wikipedia.org/wiki/Service_number_(United_States_Navy)
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