Cunard Line's Aquitania was designed for the Southampton to New York service to work in rotation with Lusitania & Mauretania. Not as fast as the other two but bigger & more luxurious than Olympic, she was an excellent choice for the service. Not having been designed as an auxiliary cruiser, she was employed as a troopship & hospital ship throughout WW1. here she is depicted as a troopship in a WW1 dazzle camouflage scheme.
In 36 years of service, Aquitania survived military duty in two world wars and returned to passenger service after each. Aquitania's record for the longest service career of any 20th-century express liner stood until broken in 2004 by the Queen Elizabeth 2, which extended the mark to 40 years.