What is "jankers"

n. 1 (context British military slang English) A form of military punishment which involves being confined to barracks, performing tedious and often pointless tasks, and being subjected to frequent uniform inspections. 2 (context plural only English) defaulters

In the British Armed Services, jankers or Restrictions of Privileges is an official punishment for a minor breach of discipline, as opposed to the more severe punishment of "detention" which would be given for a man committing a more serious or criminal offence. To be "on jankers" meant the serviceman or woman had been put on a charge by a non-commissioned officer (NCO) or occasionally a commissioned officer, (referred to in service slang as "being put on a fizzer") and so having his alleged offence entered on a Charge Report (Army or RAF Form No. 252). After appearing before an officer, the punishment might be ordered by the officer only after he has heard the evidence and had considered any mitigating factors.