 Complete the following phrase:  Further evaluation of the remaining aircraft took place during 1979. Wing Commander and later Air Vice-Marshal Bob Richardson test-flew a Mirage 2000 in April 1979, and reported that while the aircraft had excellent aerodynamic characteristics, its avionics, radar, fuel system, cockpit and weapons capability were inferior to those of US designs. Richardson also test-flew a YF-17 that was being used as a demonstrator for the F-18L in mid-1979, and was impressed by its capabilities. No F-18Ls had been ordered at this time, and the RAAF did not want to take on the risk of being the lead customer for the design. At about the same time, the RAAF rejected an offer of F-14 Tomcats that had been originally ordered by the Iranian Government but not delivered as a result of the 