DIEGO GARCIA, British Indian Ocean Territory (Aug. 21, 2020) The Los Angeles-class fast attack submarine USS Greeneville (SSN 772) enters the harbor at Diego Garcia, Aug. 21, 2020. Sailors assigned to U.S. Navy Support Facility (NSF) Diego Garcia provided mail delivery and trash disposal for Greenville. NSF Diego Garcia provides logistic, service, recreational and administrative support to U.S. and Allied Forces forward deployed to the Indian Ocean and Arabian Gulf. (U.S. Navy photo by Mass Communication Specialist Seaman Michael T. Porterfield)