• FSO = Full Service Office              • ESO = Emergency Service Office Cuba NMCRS Guantanamo Bay, ESO Navy-Marine Corps Relief Society PSC 1005, Box 25 FPO AE 09593-1000 For after-hours help, contact the Jacksonville office. Hours: Upon request Phone: 011- 53-99-4394 Fax: 011-53-99-4498 Additional Services: STAP Return to the main Locations page This page last updated on December 8, 2010