USNS COMFORT & USNS MERCY. Both ships are huge, 894-feet (272-meter) leviathans with a flight deck displacing 69,360 tons. They have a combined 2,000 beds, 24 fully equipped operating rooms, radiological services, medical labs, intensive care units, dental services, physical therapy and burn care, pharmacies, optometry labs, CAT scan and four oxygen factories. Together with volunteers from non-governmental medical organizations, they help tens of thousands of civilians affected by natural disasters. The US Navy's floating hospitals played a very important role in the aftermath of the Haiti earthquake, the South East Asia tsunami and Hurricane Katrina, to name just a few.