ANNEX. PROPOSED CONSTITUTION AND DUTIES OF I.S.O. Constitution. 2 Naval Officers (Commander Studd, R.N. (Ltd.) (Lt. Leveson, RNVR. 1 Army Officer Major Arthur (G.S.P.) 1 Air Force Officer Sq/Ldr. Godfrey. Secretary For consideration. 2. Duties. Main Duty. Providing J.P.S., E.P.S., A.C.O., Force Commanders & J.I.C. with intelligence requirements for operational planning. Details of Duties. Providing topographical (a) In initial stages of operations intelligence before an I.S.T.D. report is ready. (b) In cases where for reasons of time or security it is not practicable to provide all staffs and formations with an I.S.T.D.