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National security space institute

military training institute in the U.S. Space Force

Pronunciation
/ˈnæʃənəl səˈkjʊrədi speɪs ˈɪnstəˌtjut/
/ˈnaʃənəl sɪˈkjɔːrɪti speɪs ˈɪnstɪtjuːt/