 It is also grouped as OR-7 in NATO, equivalent to Sergeant 1st Class, Master Sergeant, or Chief Petty Officer in the US Armed forces, and to Warrant Officer Class 2 in the British Army and Royal Navy.In navy context NCOs of this rank were formally addressed as "Herr Oberfähnrich" also informally / short "Oberfähnrich".The sequence of ranks (top-down approach) in that particular group is as follows