officer of the guard

noun Military.
an officer, acting under the officer of the day, who is responsible for the instruction, discipline, and performance of duty of the guard in a post, camp, or station. Abbreviation: OG, O.G.
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officer of the guard
 
n
OG a junior officer whose duty is to command a ceremonial guard

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The two ex-rulers were not allowed to meet or converse together, even at meals, without an officer of the guard at their elbow.
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