The RFA Argus is preparing to leave Falmouth for Sierra Leone where it will help in the battle against the spread of the Ebola virus.
It will transport 750 servicemen and women and three Merlin helicopters to help support training and treatment centres.
It will also be equipped with 100 beds including a critical care unit.
Royal Marines from Plymouth have gone ashore in Sierra Leone to help the fight against ebola.
A British military ship carrying supplies and off road vehicles has arrived in Ebola-hit Sierra Leone
More than 750 military personnel and the medical ship RFA Argus are being sent to West Africa to help contain the Ebola outbreak.