 Complete the following phrase:  Murphy began research into disaster robotics in 1995, motivated by the Oklahoma City bombing. Murphy was the director of the Center for Robot-Assisted Search and Rescue CRASASR from 2002 to 2018, and now serves as the vice-president. Through CRASAR she participated in the 911 World Trade Center disaster 2001, considered the first use of robots for the emergency response phase of a disaster. Since then she has helped insert unmanned ground, aerial, and marine systems into 27 disasters including Hurricane Katrina, which is considered the first use of small unmanned aerial systems, the 