 The aircraft was one of the few in the theater equipped with the trimetrogon camera system, which allowed the creation of photo mosaics for generating maps.The crew replaced the engines, stripped the plane of extra weight, and augmented it with several additional guns, including dual .50 caliber M2 Brownings in both the radio compartment and both waist positions, and a fixed .50 in the nose for Zeamer to fire himself from the control column.Contemporary accounts including the 65th BS morning report for that day as well as Zeamer's own flight log record it as having sixteen guns total.