Final answer:
The purpose of the mortar assembly on the ACES II parachute is to deploy the parachute during an ejection sequence.
Step-by-step explanation:
The purpose of the mortar assembly on the ACES II parachute is to deploy the parachute during an ejection sequence. This assembly is an essential part of the ACES II ejection seat system which is used in military aircraft. The parachute is packed into a container and is deployed by the mortar assembly after the ejection seat separates from the aircraft. The mortar assembly provides the necessary force to rapidly deploy the parachute, allowing the pilot or crew member to safely descend to the ground.