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What does S-1 stand for?

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Rank Abbr.Meaning
S1Supplement 1 (to a document or publication)
S1Adjutant (Army)
S1Personnel Office (USMC)
S1First Heart Sound
S1Subfragment 1 (biophysics)
S-1Subfragment-1
S1Sleep Mode 1 (high-energy computer power-down state)
S-1Personnel Staff Officer
S1Starboard 1 (US NASA)
S1Secondary 1 (schools; Hong Kong)

Note: We have 15 other definitions for S-1 in our Acronym Attic