180508-N-OH262-0711 NORFOLK, Va. (May 8, 2018) Hospitalman Apprentice Ailyn Perez and Hospitalman Austin Pieters, assigned to the hospital ship USNS Comfort (T-AH 20), prepare packages of donated blood for transfer to the Department of Defense Blood Bank during a blood drive held aboard the ship, May 8. The blood drive was part of the ship's Comfort Exercise and gave the crew an opportunity to practice activating the 'Walking Blood Bank.' (U.S. Navy photo by Bill Mesta/ released)