Line handlers wait as the US Navy Hospital Ship USNS Comfort arrives pier side at Naval Station Norfolk, Tuesday, Dec. 18, 2018, in Norfolk , Va., after an 11-week medical support mission to South and Central America. The ship treated over 26,000 patients and conducted approximately 600 surgeries. (AP Photo/Steve Helber)

Line handlers wait as the US Navy Hospital Ship USNS Comfort approaches the pier at Naval Station Norfolk, Tuesday, Dec. 18, 2018, in Norfolk , Va., after an 11-week medical support mission to South and Central America. The ship treated over 26,000 patients and conducted approximately 600 surgeries. (AP Photo/Steve Helber)

Rear Admiral Sean Buck, at podium, Commander of US Naval Forces 4th Fleet, addresses the media in front of the US Navy Hospital Ship USNS Comfort as it arrives pier side at Naval Station Norfolk, Tuesday, Dec. 18, 2018, in Norfolk , Va., after an 11-week medical support mission to South and Central America. The ship treated over 26,000 patients and conducted approximately 600 surgeries. (AP Photo/Steve Helber)

Petty Officer Fred Brown, from Portsmouth, Va., is greeted by his dog Stella and wife, Jennifer, left as he arrives aboard the US Navy Hospital Ship USNS Comfort at Naval Station Norfolk, Tuesday, Dec. 18, 2018, in Norfolk , Va., after an 11-week medical support mission to South and Central America. The ship treated over 26,000 patients and conducted approximately 600 surgeries. (AP Photo/Steve Helber)