This trailed away a bit...
So i understand that the FA aura has been removed, ok(altough the game states it isnt), but neither placing an unit in garrison does not grant the attack speed buffs, rotation, etc
Neither the attack speed bonus nor Bofors ability do not become available when next to Forward Assembly with states that it should activate these.
Placing a unit inside might give the ability, but it will not give the attack speed bonus. https://imgur.com/a/paeojkd