Although SS Einsatzgruppen units originally under the command of the Sicherheitspolizei (Security Police; SiPo) had been used during these operations,[1] the German High Command felt it needed a specialist intelligence agency with police functions. One that could operate with the military, but act like a security service to arrest potential opponents and eliminate any resistance. After studying data collected in Spain, Austria and Czechoslovakia, Generaloberst Wilhelm Keitel, commander in chief of the OKW, issued the "Dienstvorschrift für die Geheime Feldpolizei" (Regulations for the secret police).