Kwajalein Atoll is not a city, but rather a group of islands in the Pacific Ocean. It is a part of the Republic of the Marshall Islands and is located in the central Pacific, about halfway between Hawaii and Australia. The atoll consists of about 97 islands and is known for its beautiful beaches and abundant marine life. The largest island in Kwajalein Atoll is called Kwajalein Island, which is home to the U.S. Army Kwajalein Atoll (USAKA) installation. The installation is used for missile testing and space surveillance purposes. The atoll's population fluctuates depending on the number of military personnel and contractors stationed there but is estimated to be around 13,000 people.