Military insult used primarily in the Air Force to describe services, personnel, finance and other support staff. This term is primarily used by aviators. It is more limited than the Army equivalent "pogue", in that not all non-combat, non-flying airmen are labeled as shoe clerks.
"We can't carry loaded weapons anymore because some f***ing shoe clerk is afraid we'll accidentally shoot ourselves."
"That retard shoe clerk got on my case about not having my PT shirt tucked in."