bodyguard

Most important public figures, such as heads of state, heads of government, and governors are protected by several bodyguards or by a team of bodyguards from a government agency, security forces, or police forces (e.g., in the U.S., the United States Secret Service or the State Department's Diplomatic Security Service). In most countries where the head of state is also their military leader, the leader's bodyguards have traditionally been royal guards, republican guards and other elite military units. Less-important public figures, or those with lower risk profiles, may be accompanied by a single bodyguard who doubles as a driver. A number of high-profile celebrities and CEOs also use bodyguards. In some countries or regions (e.g., in Latin America), wealthy people may have a bodyguard when they travel. In some cases, the security personnel use an armoured vehicle, which protects them and the VIP.source:wikipedia