Ground crew fit 75 gallon drop tanks to P-51 Mustang, GQ-I, serial number 43-12451, of the 355th Fighter Squadron, 354th Fighter Group, January 1944. The aircraft carries the marking "Peggy" on its right hand side. Printed caption on reverse: Battle of Berlin Fighter. The Mustang P-51B, newest aircraft to be used in the European Theatre of Operations, is the longest-ranged single-engined fighter in the workd - and one of the fastest. These aircraft took part in last week's great air battle, escorting Forts and Liberators deep into Germany. There is reason to believe that the new Mustang may have Berlin range. O.P.S. Fitting the auxiliary petrol tanks to the Mustang for another long flight into Germany. (Barratt's. 18/1/44).