Keegan O'Neil built a bomb as part of his plan to get Dragonstorm to accept him while they were all students at University of California Three Rivers. His goal was to use it to blow up the basketball court, with the Mauve Shirts as the activators. This would incriminate them instead of Dragonstorm.
The plan worked, despite complications. This was enough for Dragonstorm to accept O'Neil. (Nietzsche's Soldiers 3)