Livgrenadjärregementet's motto is 'Si vis pacem para
bellum'.
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Si vis pacem, para bellum
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The Latin word sic means "such" or "in this way" or "thus". It is used in modern English when quoting someone else who has clearly used bad spelling or grammar.
Since the meaning of your sentence is "IF you want peace prepare for war", the word has to be si, Latin for if: si vis pacem para bellum.
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"If you want peace, prepare for war."
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Si vis pacem, para bellum.
Latin meaning "If you wish for peace, prepare for war"