:
               
                South Korea has issued a request for bids on 36 attack helicopters to replace the 60 old AH-1F/J Cobras. Those invited to bid are:
 
    @ US Bell, with the AH-1Z King Cobra
 
    @ US Boeing, with the AH-64D Longbow Apache
 
    @ US Sikorsky, with an armed version of the UH-60 BlackHawk
 
    @ South Africa's Denel with the AH-2A Rooivalk
 
    @ Eurocopter with its Tiger
 
    @ Russia's Kamov with its Ka-50, and
 
    @ Russia's Mil with its advanced Mi-28.--Stephen V Cole