Stiletto is an EMP bomber. It can be used to immobilize units over a big area.
It makes for a great support unit for your front mates.
Coordinate attacks and defense with them and paralyze enemy units just before they engage. It is more effective than EMP drones, because they drop bombs before getting in the range of eventual AA.
If you queue an attack order followed by a move, they can drop their EMP loads and immediately do a full turn. This way you can run away from enemy’s AA and supporting fighters.