Those who voluntarily opt for early enlistment with the consent of their parents are allowed to begin full-time national service at the age of 16 years and six months.

His father, mother and younger brother, Edini voluntarily opted to accompany him.

Michael Gove is angry and more than a bit embarassed that so few schools voluntarily opted into his grand plans for academising the system back in September.

In Faretta v. California (1975), the Court held that a criminal defendant has the right to knowingly and voluntarily opt for pro se representation at trial.

The members of the TIPH voluntarily opted to be an unarmed mission.

I suspect that few people would voluntarily opt out of paid work for a benefit which seldom reaches £100 a week.

Instead, the United States has successfully lobbied more than 20 developed nations to agree to voluntarily opt out of using this agreement to import generic medicines, several officials said.

But Uwe Reinhardt of Princeton University is certain that employers would not voluntarily opt for such bare-bones catastrophic policies.

Certain small producers may opt voluntarily for setaside.

My sense is that few families would voluntarily opt to leave young children in the care of others for long stretches of time, had they financially viable alternatives.