Ex-oil tankers converted to Hospital Ships and operated by Military Sealift Command for the US Navy.
| 1975-jul-01 | Launched | Launched  T-AH-19 USNS Mercy as oil tanker SS Worth | |
| 1976-feb-01 | Launched | Launched T-AH-20 USNS Comfort as oil tanker SS Rose City | |
| 1984-jul | Refit | Refit T-AH-19 USNS Mercy conversion to Hospital Ship for US Navy | |
| 1986-nov-08 | Commissioned | Commissioned T-AH-19 USNS Mercy | |
| 1987-dec-01 | Commissioned | Commissioned T-AH-20 USNS Comfort | |
| 1988-jan | Homeport | Homeport T-AH-20 USNS Comfort to Baltimore | |
| 2010-jan-20 | Deployment | Deployment T-AH-20 USNS Comfort Operation Panlake Despatched to Haiti (arrived 20 Jan) for earthquake and responder casualty treatment, while onshore facilities were being re-established. | |
| 2013-mar | Homeport | Homeport T-AH-20 USNS Comfort Change of homeport | |
| 2017-sep-26 | Deployment | Deployment T-AH-20 USNS Comfort Hurricanes Irma, Jose and Maria Relief Operations Ordered to Puerto Rico to assist in hurricane aftermath. | |
| 2021-apr-15 | Trials | Trials T-AH-19 USNS Mercy testing its Dynamic Interface with MV-22B of HX-21. | |
Aircraft