Iran’s defense strategists recognize the growing importance of the maritime environment and are shaping its naval forces to secure Tehran’s interests accordingly.
The Islamic Revolutionary Guard Corps Navy (IRGCN) emphasizes an asymmetric doctrine to ensure national security in the Persian Gulf against regional neighbors and foreign presence.
The Islamic Republic of Iran Navy (IRIN), dubbed by the Supreme Leader as a strategic force, employs a more conventional doctrine and focuses on forward presence and naval diplomacy. Its mission areas include the Caspian Sea, the Gulf of Oman and out-of-area operations.
Both navies have considerable equities and are well positioned to influence and leverage the Strait of Hormuz; a vital chokepoint for the flow of resources and international commerce.
Read more here - US Office of Naval Intelligence Iranian Navy Paper - A Tale of Two Navies
Iranian Ship Identification Guide