MSF is best known for its rapid response in times of crisis.When a medical emergency occurs,MSF sends in an advance team to find out what kind of help is needs.This team arranges transportation,often to remote areas.Teams may travel by jeep,boat,helicopter,or even on foot.The advance team then contacts one of its four regional centers,located in Europe,East Africa,Central America,and East Asia.The center organizes teams of volunteers and sends kits of supplies and equipment.The membership of the team and the contents of the kits depend on the type of emergency.For example,in a war or naturul disaster,MSF sends in medical teams with emergency room experience and fully equipped surgical tents,electrical generators,medicine,food and clean water.