active service
noun/ˌæktɪv ˈsɜːvɪs/
/ˌæktɪv ˈsɜːrvɪs/
(especially British English) (also active duty especially in North American English)
[uncountable]- taking part in military action as a member of the armed forces, especially during a war
- on active service troops on active service
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active service