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In the good old days, the GPO was in charge of the gun position, with the BK in charge of the overall area.
In charge of 6 or 8 guns, a CP, a Â£ 1/2 million inertial navigation system and about 100 troops, plus a few other bits,it was one of the most responsible jobs for a Lieutenant in the whole Army.
Nowadays, replaced in the recce role by the BRO, with the BK running the gun area, including the gun position.