As opposed to HAHO: High Altitude, High Opening ...allows you to "fly" your chute towards the objective; gives you somewhat of an offset to your desired drop zone so the bad guys don't know where you are going to land. As if they could see you at night anyway. Both HALO and HAHO have advantages and disadvantages in terms of being a means of insertion, They are just a couple of the many different ways to "get to work".