An aerial delivery system is configured to allow delivery of one or more releasable items after the system is extracted from an aircraft. Channel material pillars extend through the stack, and vertically-stacked memory cell strings are along the channel material pillars. A metal member having an engaging portion is attached to the housing for engaging an engagement portion of the flat conductive member, so that the flat conductive member does not come off backward. The impeller is mounted to an external surface of the brake drum for rotation with the drum about an axis of rotation.