The Hsiung Feng II (HF-2; , "Brave Wind II") is an anti-ship missile system developed by the National Chung-Shan Institute of Science and Technology (NCSIST) in Taiwan. The HF-2 is designed to be deployed aboard ships or at facilities on land. An airborne version has also been developed which can be carried by the ROC Air Force's F-CK fighters. The HF-2 has ECCM capabilities and is deployed on the ROC Navy's and frigates, as well as at several land-based sites. In 2000, plans were announced to replace the HF-2 missiles stationed on the Cheng Kung frigates with the RGM-84 Harpoon, but the budget for this was cancelled. Versions There are three major versions of HF-2 in service. he first to enter service is the ship-based HF-2, with 2 twin box launcher on destroyer DD-915 first as a trial vessel. Later all major surface combatant in RoCN, except the Knox, were equipped with 2 quad-launchers, plus the 7 World War II-era guided missile destroyers that was upgraded to WC3 standard, from the late 1980s to mid-1990s, had added a 1 quad-launcher by mid-1990s to give those air defense ships an anti-surface ability. An air-launched version appeared in the early 1990s. Carried by two AT-3B trainer/attacker and a single A-3 attacker, the small force poses little threat to the marine intruders due to its small quantity. However, the recent upgraded IDF (F-CK-1C/D) will add the capacity to carry and launch the HF-2, thus greatly enhance the air-to-surface capacity of RoCAF in future. The air launcher version of HF-2 carried by AT-3 is different from the one supposed carried by original IDF (F-CK-1A/B) prototype, due to differences in length of the HF-2 missile (better known as HF-2 Mark 3 and Mark 4), where the rocket designed for one aircraft cannot fit on another aircraft. Unknown if air-launched HF-2 program is continuing at this point. The land-launch version of the HF-2 is the most secretive one because of its relation with the land-attack version of HF-2E. Fixed base versions were produced first, and all major outlying islands of Taiwan were equipped with fortified HF-2 bases in the late 1990s, replacing old HF-1 bases. Fixed HF-1 bases in the main island were also being replaced with fixed HF-2 launchers, again in fortified positions. The mobile launcher version was accepted in 2005 and went to mass production in 2006. All mobile launchers, together with mobile command