Royal Marines have begun taking over operations in part of Afghanistan, replacing 16 Air Assault Brigade, who are ending their six-month tour. Troops from 3 Commando Brigade Royal Marines, based in Devon and Arbroath, are part of a Nato force supporting the Afghan government in Helmand province. They have begun their mission in the country by joining 16 Air Assault Brigade on joint patrols. The phased handover to the Marines is taking place over several weeks. The newly arrived troops are expected to remain in the country for at least six months.