active duty

基本解释

I served two more years on active duty, with one year overseas.
我服务了两年多的现役，其中一年在海外。
The company also said it regained a contract to provide coverage for 3 million active duty and retired military members and their families in several Southern states.
这家公司同时称其已恢复了一项向几个南部各州近3百万现役及退休军事成员及他们的家庭提供保险服务的合同。
A vote on the Flag Bill proposed by a group of retired and active duty generals in the army-appointed parliament was deferred on Thursday to allow a committee to study it.
《国旗法》是由一批退役和现役的将军们在军人任命的议会中提出的。对《国旗法》的投票周四被推迟，以便让一个委员会对其进行研究。

Americans who attend these four-year colleges must serve at least five years of active duty.
General MacArthur had been recalled to active duty by President Franklin Roosevelt.
Of the few who have been identified, one is an active duty army general accused of being head of the military wing of the conspiracy, and another is an opposition political figure said to be leader of the civilian wing.

You give active duty soldiers, wounded warriors, veterans all a VIP experience at races.
WHITEHOUSE: President Obama Honors Tony Stewart’s NASCAR Sprint Cup Championship

Someone who is on active service is taking part in a war as a member of the armed forces.