The rules state 9.8.3 Unloading into an Assault Passengers not transported by Helicopter Transports may unload into an enemy occupied hex adjacent to their Transport unit. This is only permitted during the movement portion of an Assault Action. I read this as meaning they need to be loaded in a vehicle that starts adjacent to the assaulted hex or is taking part in an assault and moves half or less of its movement. The objective being to allow the carrier and its infantry to unload and assault together, otherwise the infantry would just be passengers in the assault. Both units if moving may be subject to op fire in the same hex. The rules also state if Assaulting as part of a stack then units without assault capability can split and stay in the adjacent hex, are loaded units part of a stack so this could apply to non assault transport ? If an assault capable transport moves but is not assaulting then it would be part of a Move Action, not part of an Assault Action. A recent video gameplay show a Vehicle moving (Marder capable of Assault) and unloading Infantry into an assault, is this permitted and if so do the rules need tweaking.