 The liaison program provides law enforcement officers information to assist them in recognizing one of these vehicles should it be involved in an accident and what actions to take in conjunction with the actions of the federal agents.In the case of emergency event that threatened the cargo of an OST safeguards shipment, DOE would declare a National Security Area (NSA), which temporarily places an area under effective control of the DOE/NNSA.A National Security Area is defined as an area established within the United States and used for the purpose of safeguarding classified, sensitive, and/or restricted data to protect DOE/NNSA equipment and/or material.