AG 311.5 MSIG
27 July 1943
SUBJECT: Operational Control of Signal Intelligence and Radio Intelligence Units.
TO: Commanding Generals
Eighth Air Force;
Iceland Base Command
In order to coordinate the interception of enemy radio transmissions within this theater, authoritative operational control of all Signal Intelligence and Radio Intelligence units and activities in this command is vested in the Chief Signal Officer, SOS, ETOUSA, who will detail the assignment of specific missions to such units in accordance with War Department letter AG 311.3 (3-20-43) OB-S-B-M, dated 26 March 1943, subject: "Intercept Directive."
Air Force and Ground Force Signal ...