Flight Lieutenant Trevor Gray joined the RAFVR in Manchester in 1939 and was called for service on the outbreak of war. As he was only partially trained, he was firstly sent to EFTS, Cambridge, Brough and then AFTS, Cranfield. On completing training he was awarded his wings and was posted to 7 OTU at Hawarden where he converted to Spitfires.

On 16th September, Trevor joined 64 Squadron at Leconfield and mainly flew shipping patrols over the channel. On 15th October, the Squadron moved to Coltishall covering the south-east sector and he damaged a Bf 110 in December 1940. The squadron moved to Hornchurch at the end of March 1941 and Gray left the Squadron on 3rd April, 1941, having completed his tour.

Gray was posted to 58 OTU at Grangemouth as an instructor from there he was posted to Castletown, the most northerly station on the mainland, to join 124 (Baroda and Bhopal) squadron which was then being formed. At this time Gray suffered a reduction in flying category from medical causes, which limited his flying to reduced altitude and was transferred to flying instruction duties and trained both flying instructors and recruits until 1943.

Gray was then given a post as a research engineer officer at RAE Farnborough until released from the RAF in February, 1946.