Active duty refers to a full-time occupation as part of a military force, as opposed to reserve duty. In Great Britian and the Commonwealth the equivilent term is active service.
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Famous quotes containing the words active and/or duty:
“We have not passed that subtle line between childhood and adulthood until we move from the passive voice to the active voice—that is, until we have stopped saying “It got lost,” and say, “I lost it.””
—Sydney J. Harris (b. 1917)
“Poor Casey Jones he was all right,
He stuck by his duty both day an’ night,”
—Unknown. Casey Jones. . .
Oxford Book of Light Verse, The. W. H. Auden, ed. (1938)