The United States Army uses various personnel management systems to classify soldiers in different specialties.
Enlisted soldiers are categorized by their assigned job called a Military Occupational Specialty or MOS are labeled with a short alphanumerical code called a military occupational core specialty code (MOSC), which consists of a two-digit number appended by a Latin letter. Related MOSs are grouped together by Career Management Fields (CMF). For example, an enlisted soldier with MOSC 11B works as an infantryman (his MOS), and is part of CMF 11 (the CMF for infantry).
Commissioned officers are classified by their area of concentration, or AOC. Just like enlisted MOSCs, AOCs are two digits plus a letter. Related AOCs are grouped together by specific branch of the Army or by broader in scope functional areas (FA). Typically, an officer will start in an AOC of a specific branch and move up to an FA AOC.
Warrant officers are classified by warrant officer military occupational specialty, or WOMOS. Codes consists of three digits plus a letter. Related WOMOS are grouped together by Army branch.
The Army is currently restructuring its personnel management systems. Changes took place in 2004 and will continue into 2013. Changes already taken place include deleting obsolete jobs, merging redundant jobs, and using common numbers for both enlisted CMFs and officer AOCs (e.g. "35" is military intelligence for both officers and enlisted).
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Effective 01 October 2016, Functional Areas 24 and 53 were merged into FA 26.
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(Legacy) Systems Automation Officer Functional Area (FA 53). Information Systems Managers supervise automated information processing units, installations, and activities. Advisor to the commander and staff on automation policy and technical matters. Manages computer systems and provides automation expertise at all command organizational levels to include combined, joint and service agencies. Translates mission needs into computer systems requirements and helps to define functional requirements. Maintains awareness of advances in computer systems capabilities. Performs economic analysis and plans, programs, and budgets for automation resource requirements (equipment, people, and facilities). Develops and implements procedures for the local procurement, storage and distribution control of commercial computer system products. Man-ages automation resources, maintenance programs, and logistics support. Establishes procedures for effective and efficient use of computer systems resources. Develops, implements and manages data base management systems and local area nerks. Establishes and priorities computer systems goals and objectives at various levels. Writes and maintains accreditation plans for computer systems. Develops and manages security procedures. Develops and conducts customer education programs. Develops and coordinates procedures for contingency operation during system emergencies, outages and degraded operations, or downtime for maintenance.