Have US Coast Guard ships been in the Persian gulf?

Yes, US Coast Guard ships, including cutters and patrol boats, have been in the Persian Gulf on numerous occasions. The United States has a significant naval presence in the Persian Gulf, including the U.S. Navy's Fifth Fleet, which is headquartered in Bahrain. The Coast Guard works closely with the Navy and other U.S. agencies in the region to support a variety of missions, including maritime security, search and rescue, and law enforcement.