industry, which has developed weapons and vehicles such as the Merkava battle tank series, Nesher and Kfir fighter aircraft, and various small arms such as the Galil and Tavor assault rifles, and the Uzi submachine gun. Israel has also installed a variant of the Samson RCWS, a remote controlled weapons platform, which can include machine guns, grenade launchers, and anti-tank missiles on a remotely operated turret, in pillboxes along the Israeli Gaza Strip barrier intended to prevent Palestinian militants from entering its territory. Israel has developed observation balloons equipped with sophisticated cameras and surveillance systems used to thwart terror attacks from Gaza. The IDF also possesses advanced combat engineering equipment which include the IDF Caterpillar D9 armored bulldozer, IDF Puma CEV, Tzefa Shiryon and CARPET minefield breaching rockets, and a variety of robots and explosive devices. The IDF also has several large internal research and development departments, and it purchases many technologies produced by the Israeli security industries including IAI, IMI, Elbit Systems, Rafael, and dozens of smaller firms. Many of these developments have been battle-tested in Israel's numerous military engagements, making the relationship mutually beneficial, the IDF getting tailor-made solutions and the industries a good reputation. In response to the price overruns on the US Littoral Combat Ship program, Israel is considering producing their own warships, which would take a decade and depend on diverting US financing to the project. Main developments Israel's military technology is most famous for its firearms, armored fighting vehicles (tanks, tank-converted armored personnel carriers (APCs), armored bulldozers, etc.), unmanned aerial vehicles, and rocketry (missiles and rockets). Israel also has manufactured aircraft including the Kfir (reserve), IAI Lavi (canceled), and the IAI Phalcon Airborne early warning System, and naval systems (patrol and missile ships). Much of the IDF's electronic systems (intelligence, communication, command and control, navigation etc.) are Israeli-developed, including many systems installed on foreign platforms (esp. aircraft, tanks and submarines), as are many of its precision-guided munitions. Israel is the world's largest exporter of drones. Israel Military Industries (IMI) is known for its firearms. The IMI Galil, the Uzi, the IMI Negev light machine gun and the new Tavor TAR-21 Bullpup assault rifle are used by the IDF. The Rafael Advanced Defense Systems Spike missile is one of the most widely exported ATGMs in the world. Israel is the only country in the world with an operational anti-ballistic missile defense system on the national