The UK may start national service for 18-year-olds. They will have two choices. One is a year in the army. About 30,000 people will choose this. The other is voluntary work for one weekend a month. This means volunteering in the health, ambulance or fire services. The UK's leader wants young people to learn useful skills.

Many people say national service is too expensive. There are not enough staff to train 30,000 army volunteers. A former navy boss said it would "suck" money out of defence. Young people are worried about their freedom. However, one teenager says national service works well in many countries.