Lucas joined the RAF in June 1940 and went to Canada to undertake flying training at the
Flying Training School as part of the
Empire Air Training Scheme. On completion of his training, he was assigned to
No. 66 Squadron in August 1941, based in
Cornwall, where he flew a
Spitfire on convoy patrols. He sought a transfer to Burma for more action but ended up at Malta instead, arriving there in February 1942. During the
Battle of Malta, he commanded
No. 249 Squadron. In July 1942, Lucas was awarded the
Distinguished Flying Cross. The citation read: In the autumn of 1942, Lucas was assigned as
aide-de-camp to the
Duke of Kent, but gave it up to his friend Michael Strutt, who was already acquainted with the duke. Two weeks later, on 25 August 1942, both were killed in an air crash when the
Short Sunderland flying boat in which Strutt was also a passenger crashed into a hillside near
Dunbeath, Caithness, in bad weather. This tragedy troubled Lucas. After an imposed rest period on ground duties, "flying a desk", in December 1944 Lucas asked to be given charge of an operational squadron again. After re-training on the two-crew
Mosquito, Lucas took over command of
No. 613 Squadron (City of Manchester) Squadron equipped with Mosquitos and based at
Cambrai-Épinoy in France
(Nord department). He immediately resumed his practice of "leading from the front", which gained the respect of the highly experienced squadron air crews. The squadron was involved in low-level tactical support missions and strikes. Between 1944 and 1945, he served with
RAF Second Tactical Air Force in North-West Europe. He was awarded a
Bar to his DSO in October 1945 for making numerous attacks on enemy communications, often in appalling weather conditions. He resigned his commission in 1945. ==Postwar career==