Berry joined the
Royal Air Force Volunteer Reserve on 8 August 1940 as
aircraftman 2nd class with service number 1177137. In August 1941, after completing pilot training, Berry was appointed to the rank of
sergeant and posted to a night fighter unit,
No. 256 Squadron RAF at
RAF Squires Gate and flew
Boulton Paul Defiants. He was promoted to
flying officer on 1 October 1942. Transferred to nightfighter operations in
North Africa from 30 January 1943, Berry flew
Bristol Beaufighters, initially with
No. 153 Squadron RAF. Detachments flew from
Bone,
Setif,
Souk el Arba, Souk el Khemis, and Tingley. On 11 April, while Berry and his observer were returning from patrol, the port engine caught fire on Beaufighter VIF ("TB-N"; V8629), forcing them to bale out over the Mediterranean, and wait in a rubber dinghy for six-and-a-half hours, before they were rescued. From 8 May 1943, Berry flew Beaufighters with
No. 255 Squadron RAF, which in August moved to Western Sicily, where sorties were flown over the
Salerno invasion fleet and beachhead in September. Berry shot down three enemy aircraft: on 9 September a
Messerschmitt Me 210, on 10 September another Me 210 in the Salerno area, and on 24 October he destroyed a
Junkers Ju 88 over the
Naples area. Following the second kill, Berry was forced to bail out of his Beaufighter Mk VIF (squadron code "YD-F"). As a result of his victories over Salerno and Naples, he was awarded the
Distinguished Flying Cross (DFC) on 3 March 1944, and was promoted to
flight lieutenant on 14 March. The citation for Berry's DFC read: On 3 October 1943, while serving with No. 255 Squadron, Berry was involved in the "Great E-Boat Raid" at
Cos, Greece. Sixty aircraft were involved; several Beaufighter squadrons and one Beafort squadron attacked the German Invasion Force North of the Allied occupied Island. The German invasion force consisted of several large vessels used as troop ships, destroyers, e-boats and landing barges. The attack had mixed results due to heavy enemy fire and bad weather with head winds on the return journey; the Allied squadrons took overall losses of 27%. The Beaufighter had a range of 370 miles, and due to heavy fuel consumption 25 got back, most of the others ditched or were shot down. ==V-1 campaign==