which company did he serve during world war i?
Royal Naval Air Service
Roderic Dallas
 He travelled to England at his own expense following the outbreak of World War I and became a pilot in the Royal Naval Air Service (RNAS) in August 1915. 
who was roderic dallas? An Australian fighter ace of World War I where is he from? Australia was his job related to planes? Yes, Dallas became one of the best-known pilots of Sopwith Triplanes in the RNAS. who designed it? The Sopwith Aviation Company what was the aim of building it? UNANSWERABLE when was the first time he joined the flying ace? UNANSWERABLE
wiki:4381389
Roderic Dallas [SEP] Introduction
He was appointed commanding officer of No. 1 Squadron RNAS in June 1917. On the establishment of the Royal Air Force on 1 April 1918, he took command of No. 40 Squadron. Flying Royal Aircraft Factory S.E.5s, he achieved further victories before being killed in action on 1 June 1918 while on patrol near Liévin in northern France. He was buried in Pernes.