What is the duty of the Assistant Gunner regarding the mortar after firing?

The assistant gunner plays a crucial role in ensuring the mortar operates effectively and safely after firing. One of the primary responsibilities is to swab the bore of the mortar. This process helps remove any residue or debris that results from firing, which is essential for maintaining the accuracy and reliability of subsequent shots. Additionally, the assistant gunner is tasked with assisting the crew in handling any misfires, ensuring that safety protocols are followed and the situation is rectified properly.

The act of swabbing the bore not only maintains the weapon but also prevents potential damage to the internal components of the mortar, contributing to its longevity and performance. This combination of tasks highlights the assistant gunner's responsibility for both maintenance and operational safety, making option B the most accurate choice regarding the duties after firing the mortar.