The Dutch air force , which was not an independent arm of the Dutch armed forces , but part of the Army , on 10 May operated a fleet of 155 aircraft : 28 Fokker G. 1 twin-engine destroyers ; 31 Fokker D.XXI and seven Fokker D.XVII fighters ; ten twin-engined Fokker T.V , fifteen Fokker C.X and 35 Fokker C.V light bombers , twelve Douglas DB-8 dive bombers ( used as fighters ) and seventeen Koolhoven FK-51 reconnaissance aircraft -- thus 74 of the 155 aircraft were biplanes .
The Dutch air force had 155 aircraft : 28 Fokker G. 1 twin-engine destroyers ; 31 Fokker D.XXI and seven Fokker D.XVII fighters ; ten twin-engined Fokker T.V , fifteen Fokker C.X and 35 Fokker C.V light bombers , twelve Douglas DB-8 dive bombers ( used as fighters ) and seventeen Koolhoven FK-51 reconnaissance aircraft . 74 of the 155 aircraft were biplanes .