Since the hospital ships are US Navy installations, wonder if the RealID requirement will be waived for patients and civilian medical staff that assist?
Have no problem with them waiving the RealID requirement, as long as it is documented beforehand.
US Navy policy since 2016 (DHS will fully require RealID Oct 1 for domestic air travel)
https://www.navy.mil/submit/display.asp?story_id=92983