active list 
noun
A list of the officers in an armed service who are liable to be called on for duty.Consequently, the Royal Air Force Volunteer Reserve was formed to create a pool of aircrewmen who could be brought on to the active list as soon as war seemed imminent....
- An amorous escapade saw him placed on half pay, but he was restored to the active list to rewrite the cavalry manual, and commanded cavalry brigades at Canterbury and Aldershot.
- During the same period of time, a total of 88,000 military personnel were taken from the active list,’ Hsia said.
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