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The following are the original service numbers which were first issued to United States military personnel: [2] R-1: Arthur Crean – First service number of the United States armed forces; O-1: John J. Pershing – First officer service number of the United States Army; 100 00 01: Clayton Aab — First enlisted service number of the United ...
During World War II, the officer service number range was extended to 50,000 and, during Korea, extended again to 100,000; this number was not reached by the officer corps until 1966. At that time, the Marine Corps extended the officer service numbers a final time to 125,000. Officer service numbers were then discontinued in 1972.
A military service number of the Regular 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.
At the same time, the Navy stated that the remaining service number series would be issued to enlisted personnel based on the decade in which they served. Thus, the two hundred series (200 00 01 – 299 99 99) would be held by sailors serving in the 1920s, the three hundred series in the 1930s, and so on.
The specific time at which deployment for an operation commences. (US) L-Day For "Landing Day", 1 April 1945, the day Operation Iceberg (the invasion of Okinawa) began. [5] M-Day The day on which mobilization commences or is due to commence. (NATO) N-Day The unnamed day an active duty unit is notified for deployment or redeployment. (US) O-Day
The first enlisted service number was assigned to Mason B. Herring. Service numbers were issued to enlisted personnel, based on date of entry, through the 1920s and early 1930s. In the mid-1930s, the Coast Guard also began a project to retroactively assign service numbers to former members of the Revenue Cutter Service and Lifesaving Service ...
Reserve components of the United States Armed Forces are all members of the military who serve in a reserve capacity. The National Guard is an additional reserve military component of the Army and Air Force, respectively, and is composed of National Guard units, which operate under Title 32 and under state authority as the Army National Guard ...
DMDC was established in 1974 as the Manpower Research and Data Analysis Center (MARDAC) and made a DoD tenant activity within the U.S. Navy.In 1976, it was made a Field Activity of the Office of the Assistant Secretary of Defense for Manpower & Reserve Affairs (OASD (M&RA)) and renamed the Defense Manpower Data Center (DMDC).