Background: Both hospital ships are converted San Clemente-class super tankers. Mercy was delivered in 1986 and Comfort in 1987. Normally, the ships are kept in a reduced operating status in Baltimore, Md., and San Diego, Calif., by a small crew of civilian mariners and active duty Navy medical and support personnel. Each ship can be fully activated and crewed within five days. Mercy went to the Philippines in 1987 for a humanitarian mission. Both ships were used during Operation Desert Shield/Storm. Comfort twice operated during 1994 — once for Operation Sea Signal's Cuban/Haitian migrant interdiction operations, and a second time supporting U.S. forces and agencies involved in Haiti and Operation Uphold Democracy. In 1998, Comfort participated in exercise Baltic Challenge '98, a multinational exercise involving 11 European nations and the United States to improve cooperation in peace support operations.