duty assignment,
assignment the act of distributing something to designated places or persons; "the first task is the assignment of an address to each datum"
military operation,
operation the activity of operating something (a machine or business etc.); "her smooth operation of the vehicle gave us a surprisingly comfortable ride"
search and destroy mission an operation developed for United States troops in Vietnam; troops would move through a designated area destroying troops as they found them
mission -
the organized work of a religious missionary
organisation,
organization the activity or result of distributing or disposing persons or things properly or methodically; "his organization of the work force was very efficient"