No. 155 Squadron RAF Curtiss Mohawk IV fighters in the CBI theater circa 1942

No. 155 Squadron was formed at RAF Chingford on 14 September 1918 as a bomber unit with Airco DH.9As after an earlier decision to form at RAF Feltham was abandoned. The war ended a few weeks later and the Squadron disbanded on 7 December 1918 as it had not yet become operational.

On 1 April 1942, No. 155 reformed at RAF Peshawar as a squadron but did not receive its first Curtiss Mohawk IVs until mid-August owing to the necessity to modify these aircraft for operational use. Air defense and convoy patrols began in September off Madras and in October the squadron moved to Bengal and detachments began operating over Burma. Reconnaissance, ground attack and bomber escort missions occupied the squadron until January 1944, when it finally replaced its Mohawks with Supermarine Spitfires.