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From H-II to H-IIA Further Validation of Japan's Domestic Rockets
    Though the H-IIA Launch Vehicles were built with technology inherited from the H-II Launch Vehicles, they were developed as a whole system. From the selection of parts to design and assembly, everything was revised.
The goals of the H-IIA development project were to improve reliability and reduce cost through streamlining and simplification.
Also, in reexamining the whole vehicle as one system, focus was placed on ease of use for both manufacturers and end-users.
As a result, the cost was reduced by almost half, down to 9.3 billion yen (H-IIA F4). The rockets have proven their commercial value, competitive with any in the world.
  
Main Improvements in H-IIA over H-II
Main Improvements in H-IIA over H-II image
Successful Launches of H-IIA Launch Vehicles
F1
 August 29, 2001 Flight demonstration
F2
 February 4, 2002 Mission Demonstration test Satellite-1 (MDS-1)
Demonstrator of Atmospheric reentry System with Hypervelocity (DASH)
Vehicle Evaluation Payload-3 (VEP-3)
F3
 September 10, 2002 Data Relay Test Satellite (DRTS)
Unmanned Space Experiment Recovery System (USERS)
F4
 December 14, 2002 Advanced Earth Observing Satellite-II (ADEOS II)
<Piggyback Payloads>
Federation Satellite (FedSAT)
Whale Ecology Observation Satellite System (WEOS)
Micro LabSat
F5
 March 28, 2003 Information Gathering Satellite (IGS)
F6
 November 29, 2003
(Failed)		 Information Gathering Satellite 2 (IGS)
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