Perhaps a little explanation might not go amiss.
To be “cashiered” is to be dismissed the armed forces for misconduct or misbehaviour. The term is used particularly when describing the dismissal of a commissioned officer. It was, in the past, a degrading and ritual ceremony where the officer’s epaulettes, insignia and medals were torn off, his sword broken and his cap knocked off before the assembled ranks. There are a number of explanations for the term. It is said to originate from the Dutch “casseren” or the French “casser”, both meaning to discharge. However a more likely explanation stems from the days when officers bought their commissions. Part of the sum they paid was a bond held against good behaviour and it was forfeited to the army’s cashiers in the event of their misbehaviour