 Complete the following phrase:  The BLU-82BC-130 weapon system, known under program Commando Vault and nicknamed Daisy Cutter in Vietnam for its ability to flatten a section of forest into a helicopter landing zone, is an American conventional bomb, delivered from either a C-130 or MC-130 transport aircraft or a CH-54 heavy-lift SkyCrane helicopter from the 1st Air Cavalry. A total of 225 were constructed. It was successfully used during military operations in Vietnam, 