whitmore enlisted with the raf in 1943 and was posted to the officers radio location training facilities at yatesbury, where he learned radar operations. he was posted to raf aberdaron where he took on many of the commanding officer duties to the 80 personnel stationed there. he was later posted to raf malvern where he was involved with radar development and the team producing counter measures against the german radar operations, devising new techniques to assist with the d-day landings at normandy.