Yes, got that one. You mount the 'rifle' in the mounting rack in the armoured vehicle and drop the hose and other cup, known as the OUTER cup out of the vehicle side or through the armoured hull. Then when you need to urinate, you can do it into the rifle cup knowing that you or even the most well hung or endowed member of the platoon is unlikely to miss. The contents then travel down the tube around a series of bends where they enter the outer cup and evacuate to atmosphere. The leather cup on the end of the hose acts as a venturi (...... all remember about professor venturi's law on the angular dissipation of dense gas from your school physics lessons..... And do you all remember the angle at which it naturally dissipates?) and in doing so ensures that the depression caused at the rifle cup end of the tube effectively draws all of the waste liquid from the vehicle. If the outer cup is facing rearwards this ensures that any following vehicle - or jihadi jingly bike - get liberally sprayed with the now atomised urine. Now, because they might be temporarily blinded by the beery stomach contents of Private Bloggs earlier NAAFI pi55-up, they could fail to see the sharp braking of the 7 ton Mastiff AFV ahead which could be rather unfortunate.........
Just a thought and I could be wrong
