This gallery shows you some pictures taken during the September 1979 Open Day at Air Base Twenthe . The Dutch Grasshoppers-demoteam was already in full swing at the time flying their Alouette III-helis , then painted in a Zebra-livery. Also impressive was the solo-display by demo.pilot Hans van der Werf of 312 sq. in his shark mouth-nosed & red ,white and blue-tailed F-104G Starfighter.