▁by ▁his ▁uncle , ▁who ▁was ▁a ▁f ighter ▁ace ▁during ▁World ▁War ▁I ▁( and ▁later ▁head ▁of ▁the ▁German ▁Luft wa ffe ). ▁ ▁He ▁was ▁a ▁student ▁at ▁Lund s berg s ▁board ing ▁school ▁from ▁ 1 9 2 0 ▁to ▁ 1 9 2 6 ▁and ▁at ▁AB ▁Aer om ater iel ' s ▁flight ▁school ▁in ▁ 1 9 2 9 ▁and ▁took ▁the ▁pilot ' s ▁license ▁test ▁in ▁the ▁same ▁year . ▁Von ▁Rosen ▁took ▁the ▁air line ▁pilot ▁exam ▁in ▁ 1 9 3 4 . ▁Von ▁Rosen ▁himself ▁started ▁his ▁flying ▁career ▁as ▁a ▁mechan ic ▁before ▁becoming ▁an ▁aer ob atic ▁st unt ▁pilot ▁in ▁a ▁trav elling ▁circ us . ▁ ▁Second ▁Ital o - E th iop ian ▁War , ▁ 1 9 3 5 - 1 9 3 6 ▁When ▁the ▁It ali ans ▁under ▁Ben ito ▁M uss ol ini ▁attacked ▁the ▁independent ▁emp ire ▁of ▁Eth iop ia , ▁von ▁Rosen ▁joined ▁the ▁Swedish ▁Red ▁Cross ▁amb ul ance ▁mission . ▁He ▁also ▁repeatedly ▁fle w ▁cas ual ties ▁out ▁from ▁the ▁battle field ▁under ▁extremely ▁dangerous ▁conditions . ▁This ▁activity ▁resulted ▁in ▁him ▁receiving ▁must ard ▁gas ▁burn s ▁due ▁to ▁the ▁use ▁of ▁the ▁gas ▁by ▁the ▁Italian ▁Air ▁Force . ▁ ▁After ▁his ▁return ▁from ▁the ▁war ▁in ▁Eth iop ia , ▁he ▁went ▁to ▁the ▁Netherlands ▁to ▁join ▁K LM , ▁the ▁first ▁public ▁air line ▁in ▁the ▁world , ▁and ▁became ▁one