"active duties" is a correct and usable phrase in English.
You can use it to describe tasks that must be actively performed. For example: The soldier was given a number of active duties while serving in the army.
"We have followed our internal procedures and we can confirm that this person was suspended from active duties just before Christmas," it said.
In 1914 Bergson retired from all active duties at the Collège de France, although he did not formally retire from the chair until 1921.
Some in America, he says, are awarded it purely as an "honourable lifetime achievement award", rather than to fulfil any active duties.
He said that while he can no longer perform the active duties of a police officer on the street, his disability pension does not prohibit the administrative work he will be doing as an assistant commissioner.
In mid-April Mr Ford stepped down from active duties as an elder, although not from the post itself, to parry complaints from parishioners about his position on gay marriage.
At a pledging conference in Brussels next week, and then at the EU's Nice summit in early December, the guidelines will be set for the 60,000-strong force that the EU's governments have promised will be ready for a range of active duties by 2003.
