Seems like it would be a good force multiplier for initial assaults, SOF, advance teams, and so forth. Obvious advantage is lighter weight and one man pack, but I also think the speed of deployment would be a big advantage. Imagine laying accurate indirect fire on a 500m target as the helocopter is lifting off after the insertion. That would be very fast and help helo survivability, IMO.
Unless you hit the helicopter with a mortar round accidentally. Some of my IA counterparts scared one of our pilots by shooting their mortar as the chopper was coming in for a landing at our COP.