It is great to see these Gunners in a different sort of pose, loading up their Self Propelled Gun and not in a firing role.
Many makers only have loading, aiming, but that can't happen unless the 'bombs' are on board.
Interesting to see the empty cartridge case included. Prior to action, the cart cases would be filled with a charge and then bot cartridge and projectile loading into the breech.
These guns were primary used in indirect fire, due to their long range the gunners didn't see the target, but fired to instructions from a command post who go fire orders from a forward observer.
Well Done,
John