Panzer II variants the Pz.Kpfw. IIJ, it was redesigned after the Panzer V Panther, most noticeably with the introduction of fully sloped frontal armor. Two versions were initially planned, a lighter, faster 18-ton variant and a slower, 26-ton vehicle; the former was abandoned at an early stage. Subsequently, work on the first prototype was abandoned when it was determined that the vehicle was underarmed for its weight, and versions of the Panzer IV and V could serve just as well in the reconnaissance role while being more capable of defending themselves. This vehicle never received an official Panzerkampfwagen title, but it would have
AI Mk. IV radar delays in the new units. By May the issues with the Pye design were ironed out, and the FIU's testing revealed it to be superior to the Mk. IV, especially in terms of maintenance. An RAE report agreed. The first updated Mk. V sets arrived in April 1942 and were fitted to the de Havilland Mosquito as they became available. A Mk. V equipped Mosquito claimed its first kill on 24/25 June, when a Mosquito NF.II from No. 151 Squadron shot down a Dornier Do 217E-4 over the North Sea. In practice it was found that pilots had considerable difficulty