What does SCA/SMS stand for?

Shuttle Carrier Aircraft/Shuttle Mission Simulator (NASA)

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Sydney Catchment Authority (Australia) Symposium on Computer Architecture (various locations) Synchronous Clock Adjustment System Communication Architecture System Concept Analysis Systems Configuration Administrator Systems Constant Area Society for Cardiac Angiography and Intervention Scientific Council for Africa South of the Sahara Self-Consistently Adapted (Core Reference State) Quasi-Degenerate Many-Body Perturbation Theory		Spinocerebellar Aataxia Type 1 Spinocerebellar Ataxia Type 2 Stem Cell Antigen-2 Spinocerebellar Ataxia type 3 (also known as Machado-Joseph Disease) Spinocerebellar Ataxia Type 6 Spinocerebellar Ataxia Type 7 Spinocerebellar Ataxia Type 8 Saskatchewan Council of Archives and Archivists (Canada) School Curriculum and Assessment Authority (England, UK) Second Chance Animal Aid (China)