During World War II he served in the
Royal Air Force from 1940, becoming an air gunner in March 1941 and graduating as a pilot officer in October. Posted to
419 Squadron he manned the rear gun turret on over 40 missions, which eventually won him the
Distinguished Flying Cross medal. But on the night of September 16, 1942 he was on board a
Halifax Mk II LW240 bomber when it was shot down during a raid on
Modane in France. He was captured and imprisoned in the
Stalag Luft III prison camp. To help pass the time he ran art classes for other prisoners, and soon his skills were employed by the Escape Committee's head of forgery
Tim Walenn, drawing maps and forging identity passes and papers. He also kept a pictorial record of the tunnel dig. Kenyon was due to be escaper number 120, but the tunnel was discovered in March 1944 as the escape was in progress with only 76 of the planned 220 prisoners free. Recovered after the war, his drawings were included in the first editions of
Paul Brickhill's
Escape to Danger (1946) and
The Great Escape (1951), for which he also designed the cover. They were privately published in the 1970s as a portfolio. ==Commercial artist==