With more than 700 medical personnel, the ability to store 5,000 units of blood, and 12 operating rooms, the USNS Comfort is one of the United States' largest trauma facilities. In fact, it is the world's largest floating hospital. Built inside a converted oil tanker, this U.S. Naval hospital ship has traveled the world to save lives. This month on Vital Signs, join CNN's Dr. Sanjay Gupta on board the USNS Comfort as it docks in Kingston, Jamaica to deliver critical healthcare to people in need. Meet the nurses, doctors, and surgeons who are dedicated to bringing life-changing services to patients all across the Caribbean and Central and South America. It's a behind-the-scenes look at how a highly-trained hospital staff can help when it takes to the high seas.