The attack of Pearl Harbor led to the construction of Tripler Army Medical Center. For four years following the 1941 attack, the patient population at Tripler General Hospital at Fort Shafter remained at approximately 2,000. Today, Tripler Army Medical Center is the only federal tertiary care hospital in the Pacific Basin. It supports 264,000 local active duty and retired military personnel, their families, and veteran beneficiaries. In addition, the referral population includes 171,000 military personnel, family members, veteran beneficiaries, residents of nine U.S. affiliated jurisdictions (American Samoa, Guam, and the former Trust Territories), and forward-deployed forces in more than 40 countries throughout the Pacific. Tripler Army Medical Center is the home of the Pacific Regional Medical Command, one of six geographically-based regional medical commands in the U.S. Army Medical Command. In addition to Tripler, the Pacific Regional Medical Command includes Schofield Barracks Health Clinic, Medical Activity – Japan, and the provisional Medical Activity – Korea. Soldiers of the Pacific Regional Medical Command are deployed in support of Operation Iraqi Freedom, Operation Enduring Freedom, and throughout the Pacific Theater.