Navy of the Islamic Revolutionary Guard Corps

IRGC speedboats in the Shahadat Maritime Manoeuvre (1987)

On 17 September 1985, Iran's supreme leader and commander-in-chief Ruhollah Khomeini ordered Islamic Revolutionary Guard Corps to create three branches including navy.[9][7] Shortly afterwards, Hossein Alaei was appointed as the commander of the naval forces.[7] The navy was tasked to operate in the Persian Gulf and by 1987 were able to play an active role against Iraqi Navy in the Iran–Iraq War.[9]

During the "Tanker War" phase of the Iran–Iraq War, beside the regular Iranian Navy, IRGC started employing swarm tactics and surprise attacks using Boghammar speedboats fitted with rocket launchers, RPGs, and heavy machine guns. Attacks on Kuwaiti tankers, an Iraqi ally, eventually dragged the US Navy into the Persian Gulf to escort Kuwaiti tankers. As a response, IRGC ordered mining west of Farsi Island on the route of the very first caravan—the Kuwaiti supertanker SS Bridgeton escorted by four US warships—which successfully hit the tanker itself.[10][11]

The 1988 naval battle between Iran and the US, Operation Praying Mantis, resulted in half of Iran’s operational fleet being destroyed or severely damaged. The US suffered 2 casualties due to an AH-1T Sea Cobra crashing. Iran lost 1 frigate (45 crew members killed), 1 gunboat (11 crew members killed), 3 speedboats, 1 frigate, and 2 platforms.

On 21 June 2004, eight sailors and Royal Marines were seized by forces of the Revolutionary Guards' Navy while training Iraqi river patrol personnel in the Persian Gulf.[12] On 23 March 2007, fifteen sailors and Royal Marines from HMS Cornwall were seized by forces of the Revolutionary Guards' Navy in the Persian Gulf.[13]

On 7 January 2008, US officials claimed five Iranian speedboats 'harassed' United States Navy vessels in the Persian Gulf. IRGC speedboats made threatening moves and in one case even came within 180 meters of US warships. The US Navy also claimed to have received a radio transmission from Iranian boats saying: "I am coming at you. You will explode in a couple of minutes". After this US ships were said to have taken up their gun positions and were ready to open fire at one of the boats when the Iranians turned away and one of the Iranian speedboats (allegedly) dropped white boxes into the water in front of the U.S. ships, it was not clear what was in the boxes.[14]

Iranian officials and military commanders later downplayed the incidents as normal and denied having sent the radio transmission. After the US released a video showing Iranian speedboats swarming US ships in the Strait of Hormuz, Iran released its own video of the incident after suggesting the US video was staged.[15]

On 12 January 2016,10 American sailors were apprehended by IRGC officials off the coast of Farsi Island, which doubles as a naval installation for the IRGC. American officials stated that the sailors were on a training mission when one of their boats experienced a mechanical failure. During this time the vessel drifted into Iranian territorial waters spurring IRGC naval units to respond and apprehend the sailors with both vessels. US Secretary of State John Kerry engaged in a phone call with Iranian officials to defuse the situation. Iranian officials said that the sailors were in custody, but would be freed within hours, understanding that the incident was a mistake.[16]

In 2019, the IRGC Navy allegedly carried out a series of attacks on international vessels in the Gulf of Oman and seized vessels taking them to Iran.[17][18] As a result the United States started the International Maritime Security Construct (IMSC) which increases overall surveillance and security in key waterways in the Middle East, according to the Deputy Secretary of Defense Michael Mulroy.[19]

According to 'The Military Balance 2020' of the International Institute of Strategic Studies (IISS), the inventory includes:

In addition to the vessels mentioned above, IRGC operates a fleet of armed speedboats with displacement below 10 tonnes,[1] the exact number of which is unknown.[22] Back in 2007, the U.S. Office of Naval Intelligence estimated IRGC had a fleet of 1,000 speedboats that was growing.[23] As of 2011, estimates ranged widely from "hundreds" to "several thousand".[24] The number was put between 3,000 to 5,000 vessels according to most recent reports in 2020.[25]

Classes of speedboats in the inventory include:

• Boghammar or Tareq class (IISS estimates c.40 operational in 2020)[1]
• Ashura class[22]
• Cougar class[22]
• FB-class (RIB-33)[22]
• Murce class[22]
• Bahman class catamaran[26]
• Gashti class[22]
• Kuch class[22]
• Bladerunner of Seraj-class[22]
• Heidar class
• Meead class[27]
• Kajami class
• Gahjae class
• Tarlan class
• MIL 55 class
• MIL 40 class
• Zafar class

• Al-Sabehat, swimmer delivery vehicle[26]
• Bavar 2, wing-in-ground effect air vehicle[1]

Based on the IISS report, as of 2020 Iranian aircraft inventory includes:

• Noor, based on the Chinese C-802 (+)
• Kowsar, based on the Chinese C-701 (+)
• Kowsar, based on the Chinese TL-10 (+)
• Nasr-1, based on the Chinese TL-6 (+)
• HY-2 Silkworm (+)
• Qader, medium-range anti-ship cruise missile
• Persian Gulf (Khalij Fars) , Anti ship ballistic missile (ASBM) based on Fateh-110.

• 
  Firing Nasr-1 Missile from a truck launcher in Velayat-90 Naval Exercise
• 
  Qader

• Hoot, can be launched from IRGCN speedboats and torpedoboats