In the Spring of 1943 the final preparations for the invasion of the Continent began to take shape when 21st Army Group was formed out of the oper- ational part of G.H.Q. Home Forces and Army Co-operation Command was converted into the Second Tactical Air Force. These changes meant that the forces, which had been working in the United Kingdom, had to be supplemented by the addition of many units from other sources and both the Army and the Air Force received units from the Middle East and the Latter was given several squadrons from Fighter Command.     Strategic Photographic Reconnaissance had been done for G.H.Q. Home Forces and A.C. Command by No. 140 Squadron since 1941 and it was at once obvious that the requirements of the British Invasion Forces could not be met by the effort of only one squadron, especially in view of recent developments in Night Photo- graphy. It was decided, therefore, to form a Photographic Reconnaissance Wing which would work for the Headquarters of 21 Army Group and Second Tactical Air Force and 34 Wing, of the dying A.C. Command, gave its title and some of its Headquarters Staff to a new wing which was ordered to form on 1st July 1943 at Hartford Bridge with the existing 140 Squadron as its focal point and No. 16 Squadron - a tactical reconnaissance squadron from A.C. Command - to make up strength. -+ Sorry, your browser does not support inline SVG.