AbstractNational SecurityPublic Safety and Emergency ManagementInteroperability Challenges: People, Process, and TechnologyRepresentative Challenges: Policy and Procedure (AKA Process Engineering)Representative Challenges: Personnel (AKA Human Engineering)Representative Challenges: Technology (AKA Network and Design Engineering)The National Public Safety Broadband Network (AKA FirstNet)National Security: Real-World Attack ScenariosTakeawaysEndnotes