Barrack Room Lawyer

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Name for a soldier who can quote the rulebook at every opportunity, in an effort to dodge work, skip room inspections or generally dick about his sub-ordinates. These people are generally seen as tossers, until the time that you need to dodge work, skip an inspection or dick about your sub-ordinates. Then they are some kind of learned hero.

Also the name of an arrse user who knows a lot about being a TA PTI.