Dragon SD.KFZ 251/21 AUSF D SCHUTZEThe SdKfz 251 21, also known as the Mittlerer Schutzenpanzerwagen Drilling MG 151, was a very effective production anti aircraft version of the SdKfz 251 halftrack. Mounted with three excellent 15mm MG 151 15 or 20mm MG 151 20 machine guns on a compact pedestal behind a small armoured shield, having a rate of 700 rounds per minute per gun, these modified SdKfz251 halftracks could provide very effective defensive fire against the Allied aircraft.