KSDA-FM is the call sign for the radio station JOY FM broadcast at 91.9 FM from Agana Heights, in the United States territory of Guam. KSDA began as "Adventist World Radio-Asia" in 1987 and continues to broadcast on shortwave from Agat, Guam to various countries in Asia.
Wikipedia

Agana Heights is one of the nineteen villages in the United States territory of Guam. It is located in the hills south of Hagåtña, in the central part of the island. The United States Naval Hospital is located in this largely residential village.
Wikipedia

Guam is a U.S. island territory in Micronesia, in the Western Pacific. It's distinguished by tropical beaches, Chamorro villages and ancient latte-stone pillars. Guam’s WWII significance is on view at the War in the Pacific National Historical Park, whose sites include Asan Beach, a former battlefield. The island’s Spanish colonial heritage is evident in Fort Nuestra Señora de la Soledad, atop a bluff in Umatac.
Wikipedia