Graham joined the 433 Squadron of the RCAF, the “Porcupines”, Bomber Command, and became a Flight Sergeant Air Gunner.
The 433 Porcupine Bomber Squadron’s 1st Op was on Jan 2, 1944 (mining) and the last Op was on Apr 25, 1945 (bombing). They flew 2,316 total sorties with a 90.07% success rate.
During one particular mission with the 433 Porcupine Squadron on March 31, 1945 on Op 208 – Hamburg, a 500-bomber raid, set out with Mustang fighter escorts for the first time. F/Sgt Graham, manning the Mid/Upper Gun, was credited with shooting down an Me 262 Schwalbe (Swallow); the first German jet aircraft which had attacked 16 times in 9 minutes. He was the first Canadian Gunner to do so and also recorded the only kill for their Lancaster.