Standing Operating Procedure(по проведению оперативных мероприятий; intelligence SOP refers to a unit's unique procedures, which are not necessarily standard to another unit Val_Ships)
operative under deep cover(англ. термин взят из статьи: Edbrook C.D. Principles of deep cover // Studies in Intelligence. – Vol. 5. – Issue: Summer. – CIA, 1961. – pp. 1 – 29 (declassified in 1995). Alex_Odeychuk)
intelligence officer under official cover(англ. термин взят из статьи: Edbrook C.D. Principles of deep cover // Studies in Intelligence. – Vol. 5. – Issue: Summer. – CIA, 1961. – pp. 1 – 29 (declassified in 1995). Alex_Odeychuk)