The Sa'ar 4.5-class missile boats () is a class of Israeli Sea Corps missile boats designed and built by Israel Shipyards Ltd. as an improved and stretched . There are two different subclasses that are both named Sa'ar 4.5. The first subclass was initially called Chochit (), but renamed to Aliya (). Two Aliya-subclass boats are in service with the Mexican Navy. The second subclass was initially called Nirit () but renamed to Hetz (). History The original construction plan for Sa'ar 4.5-class missile boats included: Two helicopter-equipped boats (Aliya subclass): INS Aliya INS Geula Three ordinary missile boats (Hetz subclass): INS Romach (launched and commissioned in 1981), INS Keshet (launched and commissioned in 1982) and INS Nirit The keel of INS Nirit was laid in 1984 but the construction ceased due to lack of funds and it was finally launched in 1990 and commissioned in 1991 with some modern equipment, eventuality renamed to INS Hetz. Consequently the older INS Romach and INS Keshet were upgraded to match INS Hetzs specifications. , , and INS Yaffo''' commissioned in 1997, 1997, and 1998 respectively. Particularly INS Kidon and INS Yaffo were built comprising various older systems that were disassembled from Sa'ar 4-class boats with the same names, atop brand new Sa'ar 4.5-class hulls. INS Tarshish possibly also comprised some weapon systems dismounted from the Sa'ar 4-class missile boat with the same name, atop a new Sa'ar 4.5-class hull. Another two further-upgraded Sa'ar 4.5 Hetz-subclass missile boats called and were commissioned in 2002 and 2003, raising the number of Sa'ar 4.5 Hetz-subclass missile boats to eight. Subclasses Aliya subclass The first two Sa'ar 4.5 boats were Aliya subclass. Two boats of this version were built and launched in 1980, the first one being , followed by . Additionally to the anti-ship missiles, these missile boats were equipped with aviation facilities that could accommodate two (one on a regular basis) Bell 206, MD 500, or HH-65 helicopters. Eurocopter Panther was the last helicopter deployed on these boats in the Israeli Navy. The Aliya subclass are the smallest warships with a helipad and helicopter hangar. In August 1984, INS Aliya and INS Geula were sent to destroy a terrorist facility in Nahr al-Bared, northern Lebanon. Two MD 500 Defenders from INS Aliya and another two from INS Geula successfully hit the target. In July 1985, INS Aliya and INS Geula carried out a similar