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Discover LudwigThe phrase "active duty" is correct and can be used in written English.
This phrase is commonly used to refer to military personnel who are currently fulfilling their military service obligations. For example, "The Colonel has been on active duty for the past five years."
Dictionary
active duty
noun
A state in which person in the military performs military duties on a full-time basis, as opposed to reserve, where one only occasionally performs military duties.
Exact(55)
It was also activated into the Active duty force.
Because of the short period of active duty and concerns arising from his partisan political activities during his last two tours of active duty, Commander Kirk must complete this form prior to his entry on active duty.
Active duty WWII.
I'm still active duty.
Around seven percent are on active duty.
This is an active duty schedule.
Similar(5)
No active-duty soldier has been executed since 1961.
Georgia's military now includes 33,000 active-duty personnel.
It's unusual, however, for active-duty soldiers to belong.
Active-duty soldiers on average receive $4,962.
Women are fifteen per cent of the active-duty forces.
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CEO of Professional Science Editing for Scientists @ prosciediting.com