quadruple launchers in an attempt to improve air defence. This new model also had improved, more powerful engines, and new cylindrical missile boxes, with the improved P-15U missiles. The later 205M and 205 mod boats had longer tubes for the further-improved P-15M missiles. Variants The Project 205's hull proved to be very versatile and were used as the basis for a whole series of Soviet fast attack craft and patrol boats. Project 205 ("Osa I"): Original missile boat, recognisable by the box-shaped missile launchers for the P-15/P-15T Termit missiles. 160 built. Project 205E: Project 205 with 4 KT-62K missile launchers for P-25 missiles and a forward hydroplane, making it capable of reaching up to . 1 built. Project 205Ch: Project 205 with electric equipment on 400 Hz. 1 built. Project 205U ("Osa II"): Upgraded Project 205 with tube-shaped missile launchers for the improved P-15U missile. 32 built. Project 205ER: Main export version of the Project 205U. Nikhrom-RRM IFF/ESM, Nickel IFF, and ARP-58SV radio direction finder removed. Project 205M: Longer missile tubes for P-15M missiles with new Graviy radar complex instead of Rangout/Rys complex. 1 built. Project 205mod: P-15M missile instead of P-15U. 19 built. Project 205P Tarantul ("Stenka"): Anti-submarine patrol boat version. In addition to the above, the Project 206 family of fast attack craft (NATO: Shershen, Turya, and Matka class) are based on the Project 205 and share a common engine room design. Combat service These missile boats saw action during the War of Attrition, Yom Kippur War, and Indo-Pakistani War of 1971. The Israeli Saar missile-boats sank a Syrian Osa class missile-boat during the Battle of Latakia and three Egyptian Osa class missile-boats in the Battle of Baltim. No Israeli ships were damaged in these battles. In contrast, the Indian Navy Osa missile-boats were very successful against the Pakistani Navy in Operation Trident, with a total of five ships sunk, two damaged beyond repair, an oil facility destroyed and Karachi Port held under blockade for no losses. Osas were also used in the Iran–Iraq War, with few losses, especially in a single battle in 1980 when several were destroyed by F-4s with AGM-65s. This battle occurred on 29 November 1980 and the Iraqi Navy incurred some damage. Iraq has lost only five missile boats during the eight years of war. Syrian Osa II's have been used in the Syrian Civil War. Osa IIs were filmed firing their deck