He then transferred to aviation .
Pishvanov enlisted just after hostilities broke out , and began World War I as a Nijnichin in the cavalry , serving through Summer 1915 , and winning all four classes of the Cross of Saint George .
Nijnichin then transferred to aviation .
Pishvanov enlisted just after hostilities broke out , and began World War I as a Nijnichin in the cavalry , serving through Summer 1915 , and winning all four classes of the Cross of Saint George .