Dan,
If you were referring to Australian documents, I would say that the 'WE' in the tilte of the document would mean War Establishment (as opposed to Peace Establishment), or in short the personnel and materiel entitlement of a unit in either war or peace. But you've already sussed that out.
Within the body of the document, it is possible that the W/E refers to 'with equipment'. In other words a vehicle with its Complete Equipment Schedule, which can involve significant quantities of stuff, depending on the vehicle.
Jack
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