India initially sent the RFI for a F-16C/D Block 52+ configuration aircraft. On 17 January 2008, Lockheed Martin offered a customized version of the F-16, the F-16IN "Super Viper" for the Indian MMRCA contract. The F-16IN, which is similar to the F-16 Block 60, will be a 4.5 generation aircraft. Lockheed Martin has stated that it will be the most advanced F-16 variant developed. It will be more advanced than the F-16 Block 52s that the Pakistan Air Force has acquired.