N-COUNT A soldier's tour of duty is a period of time when the soldier is involved in a particular duty or stationed in a particular place such as a war zone. 勤务
...a Green Beret who served two tours of duty in Vietnam.
...一位两次在越南执行勤务的绿色贝雷帽成员。
The soldiers all used to do a six-month tour of duty in Northern Ireland.
士兵过去都要在北爱尔兰服役六个月。
In 1968, he received orders for his second tour of duty to Vietnam.
1968年，他接到第二个调令去了越南。
Troops deploying to Iraq or Afghanistan after August 1 will have their tour of duty reduced from 15 months to 12 months.
8月1日起，驻伊拉克、阿富汗的美军服役期将从15个月减至12个月。
He is believed to have had serious reservations about the upcoming tour of duty in a Muslim nation.
VOA: standard.2009.11.10
U.S.Army Sergeant Jeremy Tormala, on his second tour of duty in Iraq, thought the elections gave a good indication that Iraqi forces will be up to the task.
VOA: standard.2010.03.08
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