Original: The 14,562 acre (58.93 km ² or 22.753 sq mi) island is currently controlled by the United States Navy and is used as a weapons testing and training facility, served by Naval Outlying Field San Nicolas Island.
Simplified: The 14,562 acre (58.93 km ² or 22.753 sq mi) island is used by the United States Navy for a weapons testing and training.