active duty
noun/ˌæktɪv ˈdjuːti/
/ˌæktɪv ˈduːti/
(especially North American English) (also active service especially in British English)
[uncountable]- taking part in military action as a member of the armed forces
- He has been treated in hospital and is returning to active duty.
- on active duty He sustained serious injuries while on active duty.
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active duty